C1922 – Tire Air Pressure Low – Tire 2

The Mitsubishi fault code C1922 – Tyre Air Pressure Low (Tyre 2) is a manufacturer-specific diagnostic trouble code stored by the TPMS (Tyre Pressure Monitoring System) ECU — also referred to on some Mitsubishi platforms as the W/C (Wheel Control) ECU — indicating that the tyre pressure sensor in the wheel designated as Tyre 2 has transmitted a pressure reading below the system’s minimum alert threshold. On the standard Mitsubishi four-wheel TPMS numbering layout, Tyre 2 corresponds to the front right wheel. The TPMS warning light will be illuminated and the fault must be addressed promptly — a significantly under-inflated front tyre directly affects steering response, braking distances, and tyre integrity at speed.

What Does C1922 Mean on a Mitsubishi?

Each wheel on a Mitsubishi vehicle equipped with a direct TPMS system carries a battery-powered radio frequency sensor mounted inside the rim on the valve stem. Each sensor periodically broadcasts a data packet containing its unique ID, current tyre pressure, temperature, and battery status to the TPMS ECU. The TPMS ECU compares the received pressure value from each sensor against the vehicle’s programmed alert threshold — typically set at approximately 25% below the recommended cold inflation pressure from the vehicle placard. C1922 is stored when the Tyre 2 sensor transmits a pressure value below this threshold, or when the TPMS ECU calculates that the Tyre 2 pressure has dropped below the warning level. Unlike a reception failure code, C1922 confirms the sensor is communicating correctly — the pressure reading itself is the problem.

Symptoms of C1922

C1922 presents with the following indicators:

• TPMS warning light illuminated on the instrument cluster — typically a cross-section tyre profile with an exclamation mark
• C1922 stored in the TPMS ECU when scanned with MUT-III or a compatible scanner
• Front right tyre visibly low or flat in more severe cases of pressure loss
• Pulling toward the right under braking or at speed if pressure loss is significant
• Increased tyre wall flexing noise or a thumping sensation at speed if the tyre is substantially under-inflated
• Reduced steering response and increased effort at the steering wheel in severe cases
• Reduced fuel economy due to increased rolling resistance from the under-inflated tyre
• No other warning lights in most cases — C1922 is a TPMS pressure alert, not a sensor or system fault code

Common Causes of C1922

• Gradual natural pressure loss — all tyres lose pressure slowly over time through permeation through the rubber and micro-leaks at the valve; the most common cause of C1922 in the absence of visible tyre damage or a discovered puncture
• Puncture — nail, screw, or road debris embedded in the tread — a slow leak from a penetrating object in the front right tread is the most common cause of a single-tyre low pressure alert
• Damaged or leaking valve stem — a cracked rubber valve stem or a corroded or loose TPMS valve core allowing air to escape at the valve
• Bead seal leak — air escaping between the tyre bead and the rim, most commonly caused by corrosion on the alloy wheel bead seat or impact damage from kerbing
• Tyre sidewall damage — a slow leak or structural failure caused by a pothole or kerb impact creating a weakness in the sidewall rubber
• Temperature-related pressure drop — a significant ambient temperature drop of approximately 10°C reduces tyre pressure by around 0.1 bar; a tyre already at the lower end of the acceptable range may trigger C1922 in cold conditions without any physical leak
• TPMS sensor battery nearing end of life — a failing sensor battery can cause erratic or inaccurate pressure readings before the sensor stops transmitting entirely; distinguishable from a genuine pressure loss by checking the physical tyre pressure with a calibrated gauge and comparing it against the sensor-reported value
• Post-rotation sensor position mismatch — if wheels have been rotated without TPMS relearn, C1922 may be attributed to the wrong physical wheel; always verify sensor registration after any wheel change

Common Misdiagnoses

• TPMS sensor replaced without checking actual tyre pressure first: C1922 is a pressure alert — the sensor is reporting correctly. Always verify the physical tyre pressure with a calibrated gauge as the first step. If the front right tyre is genuinely low, the sensor is functioning correctly and does not require replacement.
• Tyre inflated and code cleared without identifying the leak source: Re-inflating and clearing C1922 without finding the cause of pressure loss will result in the code returning within days or weeks as the tyre deflates again. Always inspect the tyre, bead, and valve stem thoroughly before clearing the code.
• Wrong wheel investigated due to post-rotation sensor mismatch: If wheels have been rotated without TPMS relearn, the sensor now in the front right position may have been re-registered — or not — to Tyre 2. Always confirm sensor registration is current before assuming the front right wheel is the correct location of the pressure loss.
• C1922 attributed to a faulty TPMS sensor without a gauge check: A low pressure code is not a sensor fault. Verify the physical tyre pressure matches the sensor-reported value before condemning the sensor. Only if the gauge reads correct pressure but the sensor reports low should the sensor itself be investigated as the cause.

Affected Mitsubishi Vehicles

Model	Generation	Notes	Years
Outlander PHEV	GG/GF (1st Gen)	Direct TPMS standard; Tyre 2 = front right	2013–2021
Outlander PHEV	GN (2nd Gen)	Revised TPMS architecture; same C1922 definition and wheel numbering	2022–present
Outlander (non-PHEV)	GF/GG/ZJ/ZK/ZL	Direct TPMS market-dependent — verify fitment before diagnosing	2007–present
Eclipse Cross	GK/GL	Direct TPMS standard on most market variants	2017–present
ASX / RVR	GA/XD	Direct TPMS on later variants; confirm system type before diagnosing C1922	2010–present
Galant Fortis / Lancer	CY/CZ	Market-specific TPMS fitment — verify direct vs indirect before diagnosing	2007–2017

Tools & Equipment Required

Tool	Purpose	Notes
Mitsubishi MUT-III / MUT-IV	TPMS ECU scan, live sensor pressure data, code clear	Required to confirm C1922, view live pressure values, and clear after repair
Calibrated tyre pressure gauge	Verify actual front right tyre pressure	Always the first diagnostic step — compare physical pressure against sensor-reported value
TPMS activation / relearn tool	Verify sensor registration and relearn after any wheel position change	Required if post-rotation mismatch is suspected
Tyre inflator / airline	Re-inflate front right tyre to correct placard pressure	Use placard pressure from door jamb — not the tyre sidewall maximum
Soapy water or tyre leak detection spray	Locate puncture, bead leak, or valve stem leak	Apply to tread, sidewalls, bead area, and valve stem with tyre inflated
Tyre puncture repair kit	Permanent tread puncture repair from inside the tyre	Sidewall punctures are not repairable — tyre replacement required
Valve core tool	Valve core inspection and replacement	Use a TPMS-compatible valve core torqued to specification

Step-by-Step Diagnosis

• 1
  Check the Front Right Tyre Pressure with a Calibrated GaugeBefore scanning or replacing any component, physically check the front right tyre pressure with a reliable calibrated gauge. Compare the reading against the vehicle placard pressure on the driver’s door jamb or fuel filler flap. If the tyre is at the correct pressure, C1922 may be caused by a temperature-related transient drop, a recently corrected slow leak, or a sensor reporting an inaccurate low value due to a dying battery rather than a genuine active pressure loss.
• 2
  Confirm C1922 and View Live TPMS Data with MUT-IIIConnect MUT-III or equivalent and read all TPMS codes. Confirm C1922 is current. View the TPMS live data screen and note the pressure value reported by the Tyre 2 sensor. Compare the sensor-reported value against your physical gauge reading — a close match confirms the sensor is reporting accurately and the pressure is genuinely low. A significant discrepancy between the two suggests a sensor calibration issue or a near-dead sensor battery.
• 3
  Verify TPMS Sensor Registration is CurrentIf wheels have recently been rotated or changed, confirm the TPMS sensor IDs registered to the TPMS ECU match the current physical wheel positions using a TPMS relearn tool or MUT-III. A post-rotation mismatch can result in a pressure fault being attributed to the wrong physical wheel position — the tyre actually reporting low may be in a different location to the front right.
• 4
  Inflate the Tyre and Inspect for the Leak SourceIf the front right tyre is confirmed low, inflate it to the correct placard pressure. Apply soapy water or tyre leak detection spray to the full tread surface, both sidewalls, the bead area on both sides of the rim, and the valve stem. Look for consistent bubbling indicating escaping air. Pay particular attention to the tread for embedded objects and the alloy wheel bead area for corrosion-related seal failure.
• 5
  Inspect the Valve Stem and TPMS Sensor Valve CoreRemove the valve cap and check the valve core for leakage using soapy water at the valve opening. A TPMS sensor valve core must be torqued to the manufacturer’s specification — an incorrectly tightened core is a common source of slow valve leaks. On metal TPMS valve stems, inspect the grommet and stem body for corrosion damage. Replace the valve core or complete valve stem assembly as required, ensuring any replacement is TPMS-compatible.
• 6
  Monitor Pressure After Repair and Clear C1922After repairing the identified leak source and inflating the front right tyre to the correct placard pressure, drive the vehicle above 25 km/h for a short distance to allow the Tyre 2 sensor to transmit an updated pressure value to the TPMS ECU. Clear C1922 with MUT-III and confirm the TPMS warning light extinguishes. Re-check the front right tyre pressure after 24 hours to confirm the repair is holding.

Scanner Readout Explained

====================================================
  MITSUBISHI MUT-III SE — DIAGNOSTIC REPORT
====================================================
  Vehicle:     2019 Outlander PHEV (GG3W)
  Date:        2025-03-27  14:51:07
====================================================
MODULE: TPMS / W-C ECU
----------------------------------------------------
  C1922  Tyre Air Pressure Low — Tyre 2 (Front Right)
         Status:       Confirmed / Current
         Freeze Frame:
           Tyre 2 Reported Pressure:   1.7 bar (cold)
           Alert Threshold:            1.9 bar (approx. 25% below placard)
           Recommended Pressure:       2.5 bar (cold, placard)
           TPMS Warning Lamp:         ON
====================================================
  LIVE DATA (TPMS Sensor Status — All Wheels)
====================================================
  Tyre 1 (Front Left):    2.5 bar  |  21°C  |  Sensor OK
  Tyre 2 (Front Right):   1.7 bar  |  20°C  |  Sensor OK — LOW PRESSURE
  Tyre 3 (Rear Left):     2.5 bar  |  21°C  |  Sensor OK
  Tyre 4 (Rear Right):    2.5 bar  |  22°C  |  Sensor OK
====================================================
  NOTE: Sensor ID and signal status normal on
  Tyre 2. Fault is pressure value only — not
  a sensor failure or signal loss condition.
====================================================

Step-by-Step Repair Guide

Repair Path A: Tread Puncture Repair

• 1
  Locate the Puncture ObjectWith the front right tyre inflated, inspect the full tread surface for any embedded object — nail, screw, glass, or road debris. Mark the location with chalk or tape before removing the wheel. Do not remove the embedded object until the tyre is off the vehicle and ready for repair — the object often temporarily seals the hole and removing it prematurely will accelerate deflation.
• 2
  Assess Repairability Before ProceedingA puncture in the central three-quarters of the tread area caused by an object no larger than 6mm in diameter is repairable to industry standard. A puncture in the tyre shoulder, any damage to the sidewall, or a run-flat condition indicating the tyre has been driven heavily under-inflated requires tyre replacement. Do not use foam tyre sealant on a TPMS-equipped vehicle — sealant blocks the sensor pressure port and destroys the sensor.
• 3
  Repair the Puncture from the InsideRemove the tyre from the rim. Remove the puncturing object and ream the hole to clean the edges. Apply a combination plug-patch repair from the inside of the tyre following the repair kit manufacturer’s instructions. This is the only permanent industry-accepted repair method — external plug-only repairs are not a long-term solution and are not recommended for front tyres on a steering axle.
• 4
  Refit the Tyre, Inflate, and Clear C1922Refit the tyre to the rim using correct bead lubricant. Inflate to seat both bead lips, then adjust to the placard pressure. Refit the wheel and torque the wheel bolts to the workshop manual specification. Drive above 25 km/h to trigger a TPMS sensor transmission, clear C1922 with MUT-III, and confirm the TPMS warning light extinguishes. Re-check pressure after 24 hours.

Repair Path B: Valve Stem or Valve Core Leak Repair

• 1
  Replace the Valve Core if Leaking at the CoreIf soapy water applied to the open valve shows bubbling from the core, deflate the tyre, remove the old valve core using a valve core tool, and fit a new TPMS-compatible valve core. Torque to the specification in the workshop manual — typically 0.4 Nm. Do not overtighten, as excessive torque can crack the core seat in the TPMS sensor body.
• 2
  Replace the Full TPMS Valve Stem if Corroded or CrackedIf the metal TPMS valve stem body, grommet, or nut is corroded or damaged, the full valve stem assembly must be replaced. This requires the tyre to be broken off the bead. Fit the replacement valve stem using a new grommet and nut, and torque the nut to the workshop manual specification — do not overtighten against the rim or the sensor body may crack.
• 3
  Inflate, Verify No Further Leakage, and Clear C1922Inflate to the placard pressure and verify no further leakage at the valve area with soapy water. Refit the wheel and torque wheel bolts to specification. Drive above 25 km/h to trigger a TPMS transmission, clear C1922 with MUT-III, and confirm the warning light extinguishes. Re-check pressure after 24 hours.

Repair Path C: Bead Seal Leak Repair

• 1
  Break the Bead and Clean the Rim SeatRemove the tyre from the rim. Inspect the bead seat area of the rim for corrosion, oxidation pitting, or impact damage from kerbing. Clean the bead seat thoroughly with a wire brush or abrasive pad until the alloy or steel surface is clean and smooth. Severe pitting that cannot be cleaned flat may require professional rim refurbishment or rim replacement to achieve a reliable bead seal.
• 2
  Refit the Tyre with Correct Bead LubricantApply tyre bead lubricant to the tyre bead and the cleaned rim bead seat. Refit the tyre and inflate to seat both bead lips — listen and feel for each bead seating fully around the rim circumference. Do not exceed the maximum bead seating pressure stamped on the tyre sidewall. Once both beads are seated, adjust to the vehicle placard pressure.
• 3
  Verify the Bead Seal and Clear C1922Apply soapy water to both bead areas and confirm no bubbling with the tyre at placard pressure. Refit the wheel and torque the wheel bolts to specification. Drive above 25 km/h and clear C1922 with MUT-III. Re-check pressure after 24 hours — if the bead leak recurs, the rim requires professional refurbishment or replacement as the corrosion is too severe to seal reliably.

Repair Cost Estimates

Repair	Parts Cost (est.)	Labour (est.)	Total (est.)	DIY Difficulty
Tyre inflation only — no leak found	€0	0.1 hr	€0–€10	Very Easy
Valve core replacement	€1–€5	0.25 hr	€1–€35	Very Easy
Tread puncture repair (plug-patch from inside)	€5–€15	0.5 hr	€20–€60	Easy — tyre removal required
TPMS valve stem replacement	€10–€30	0.5–1 hr	€30–€90	Medium — tyre removal and torque tool required
Bead seal cleaning and reseating	€0–€10	0.5–1 hr	€30–€80	Medium — tyre machine required
Tyre replacement (if unrepairable)	€80–€220	0.5–1 hr	€100–€280	Easy — workshop tyre fitting recommended

Prevention & Maintenance Tips

• Check all four tyre pressures monthly with a calibrated gauge — TPMS only alerts at approximately 25% below the recommended pressure; a tyre can be meaningfully under-inflated for an extended period before C1922 is triggered
• Always check tyre pressures cold — tyre pressure increases as the tyre warms during driving; always measure before the first journey of the day or after the vehicle has been stationary for at least three hours for an accurate cold reading
• Re-register TPMS sensors after every wheel rotation or tyre change — failure to update sensor positions in the TPMS ECU after moving wheels will result in incorrect wheel positions being reported for any future pressure faults
• Replace TPMS valve stem grommets and nuts whenever tyres are removed — reused grommets and corroded nuts are a common source of slow valve-area air leaks on the subsequent tyre change cycle
• Inspect front tyres for embedded objects after driving on debris-covered roads or building sites — a nail in the front right tread may not cause immediate deflation but will develop into a C1922 event within hours or days
• Replace TPMS sensors proactively as they approach end of battery life — a sensor battery nearing exhaustion can produce erratic or inaccurate pressure readings before ultimately failing to transmit, creating either false pressure alerts or a reception failure code
• Avoid kerbing the front right wheel — kerb impacts are a leading cause of bead seal damage and sidewall bruising on the front right tyre, both of which can lead to slow pressure loss and C1922

Frequently Asked Questions

Can I drive my Mitsubishi with C1922 stored?

Only for a short distance at reduced speed to reach a safe location where the front right tyre can be inspected and inflated. A significantly under-inflated front tyre impairs steering response, extends braking distances, and risks rapid sidewall damage or tyre failure at speed. Do not drive normally with C1922 active until the front right tyre has been inflated to the correct placard pressure and the cause of pressure loss identified and repaired.

Will C1922 clear itself after I inflate the tyre?

The TPMS warning light will typically extinguish automatically after the front right tyre is inflated to the correct pressure and the vehicle has been driven above 25 km/h for a few minutes — this allows the Tyre 2 sensor to transmit an updated pressure value to the TPMS ECU. However, C1922 may remain stored in TPMS ECU memory even after the warning light clears and requires active clearing with MUT-III or a compatible scanner to remove it fully from the fault log.

Is C1922 caused by a faulty TPMS sensor?

In the vast majority of cases, no. C1922 is a pressure alert — the Tyre 2 sensor is communicating correctly and reporting a pressure value that is genuinely below the alert threshold. The sensor is doing its job. Only if the physical gauge reading at the front right tyre confirms the pressure is correct but the sensor continues to report a low value should the sensor itself be investigated as the source of the fault.

How do I know if C1922 is from cold weather or an actual leak?

Check the physical tyre pressure with a calibrated gauge and compare against the placard value. A temperature-driven pressure drop is typically small — around 0.1 bar per 10°C of ambient temperature decrease. If the front right tyre is more than 0.2–0.3 bar below the placard pressure, or if only the front right is low while the other three tyres read correctly, a genuine slow leak is the more probable cause and the tyre should be inspected thoroughly for punctures, valve leaks, and bead leaks.

Can I use foam tyre sealant on my Mitsubishi as a temporary fix?

No. Foam tyre sealant should not be used on TPMS-equipped vehicles. The sealant enters and blocks the pressure sensing port of the TPMS sensor, causing permanent sensor damage that requires a full sensor replacement in addition to any tyre repair. If a temporary roadside fix is needed, use a tyre plug kit rather than foam sealant, and have the tyre professionally inspected and properly repaired or replaced as soon as possible.

Can a front tyre sidewall puncture be repaired to resolve C1922?

No. Sidewall punctures are not repairable to any industry safety standard — the sidewall flexes continuously during driving and a patch or plug in this area will not hold reliably. If the pressure loss on the front right tyre is caused by sidewall damage, tyre replacement is the only safe resolution. Running a front tyre with a sidewall puncture or repair risks sudden blowout at speed.

Do I need MUT-III to clear C1922 or will the TPMS warning light clear on its own?

On most Mitsubishi models the TPMS warning light will extinguish automatically once the front right tyre has been inflated to the correct pressure and the vehicle driven above 25 km/h, giving the Tyre 2 sensor time to transmit an updated pressure value. However, C1922 may persist as a stored fault in TPMS ECU memory even after the warning light clears — MUT-III or a compatible scanner is needed to fully erase the stored code and confirm no other TPMS faults are present.

Why is only the front right tyre losing pressure while the others are fine?

Single-tyre pressure loss almost always has a specific physical cause at that individual wheel — a puncture, a leaking valve core, or a bead seal failure. The front right wheel is particularly exposed to kerb and road edge impacts compared to the front left, and the front tyres carry higher loads and endure greater lateral forces than rear tyres. Inspect the front right tyre, bead, and valve thoroughly as the cause will be specific to that wheel rather than a general pressure management issue.

Conclusion

Mitsubishi C1922 – Tyre Air Pressure Low (Tyre 2 / Front Right) is a TPMS pressure alert requiring prompt attention, particularly given the direct effect of a front tyre pressure loss on steering and braking. The first step is always to physically verify the front right tyre pressure with a calibrated gauge and identify the cause of pressure loss — whether a tread puncture, valve leak, or bead seal failure. Confirm TPMS sensor registration is current after any recent wheel movement, repair the leak source, inflate to the placard pressure, and clear C1922 with MUT-III after confirming the repair is holding.