Most Common Powertrain Systems (P-Codes)

Top trouble codes in this system, by visitor frequency.

• P0171 — Fuel system too lean
• P0300 — Random/Multiple Cylinder Misfire Detected
• P0A0F — Engine Failed to Start
• P0457 — Evaporative Emission System Leak Detected Fuel Cap Loose/Off
• P0446 — Evaporative Emission System Vent Control Circuit
• P0327 — Knock Sensor 1 Circuit Low Bank 1 or Single Sensor
• P0172 — System Too Rich Bank 1
• P0133 — Oxygen sensor 1/1 slow response

Diagnostic Guides for Powertrain Systems (P-Codes)

Free step-by-step guides written to professional diagnostic standards.