P2255 Toyota Camry – Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1)

Toyota-specific code — factory diagnostic data

Last updated: May 30, 2026

Definition source: Toyota factory description. Diagnostic guidance is based on factory-defined fault logic for this code.

P2255 on the 2014 Toyota Camry means: Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1). It is a circuit low code reported by the SFI System.

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P2255 Quick Answer

P2255 on a 2014 Toyota Camry indicates Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1). Start with a freeze-frame check and a careful inspection of the connector and wiring at the affected device before replacing any parts.

What Does P2255 Mean on a Toyota Camry?

On the 2014 Toyota Camry, the SFI System sets P2255 when it detects a fault matching its official definition: Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1). This is a manufacturer-specific definition from Toyota factory diagnostic data and applies to the XV50-generation Camry.

Symptoms

• Warning light for the affected system (check engine, ABS, airbag, or a system indicator depending on the module)
• Reduced or lost function of the sfi system
• Possible related codes from other modules on the Camry CAN/LIN network

Common Causes

• Fault in the component named in the definition (oxygen (a/f) sensor reference ground circuit low (bank 2 sensor 1))
• Open, shorted, or high-resistance wiring in the affected circuit
• Connector corrosion, water ingress, or a backed-out terminal
• Loss of supply voltage or a poor ground at the device
• Module internal fault — confirm wiring and supplies before condemning the module

Diagnostic Approach

For P2255 on the 2014 Toyota Camry you’ll want an OBD-II scan tool with live-data and freeze-frame support (a Toyota Techstream-class tool reads enhanced data), plus a digital multimeter and the wiring diagram.

• Confirm the code is current, not stored history, and record freeze-frame data.
• Read all modules — related codes often pinpoint the root cause faster than the headline code.
• Inspect and wiggle-test the connector at the named device while watching live data.
• Measure supply voltage and ground integrity at the device; verify the circuit against the Camry wiring diagram.
• Substitute or isolate the suspect device only after wiring and supplies check out.
• Clear the code and road-test through one or two drive cycles to confirm the repair.

Possible Fixes

• Repair open/short/high-resistance wiring or a corroded connector
• Restore supply voltage or ground at the affected device
• Replace the failed component named in the definition
• Replace and, where required, initialise/program the module if it is internally faulty

Can I Still Drive With P2255?

It depends on the system. SFI System faults that affect braking, the airbag/restraint system, power steering, or stability control should be repaired before further driving. Comfort or convenience faults can usually be deferred briefly, but related codes can mask one another on the Camry network — diagnose promptly.

Source

Code definition from 2014 Toyota Camry (XV50) factory diagnostic information (SFI System). Symptom, cause, and diagnosis guidance summarised from standard OBD-II diagnostic practice for this platform.