2006 Scion xB AutomaticFACTORY OEM SERVICE PROCEDURE

Fail-Safe Chart

If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.

FAIL-SAFE

DTC Component Fail-safe Operation Fail-safe Deactivation Condition
P0031, P0032, P0037 and P0038 Heated Oxygen (HO2) Sensor Heater ECM turns off HO2 sensor heater Ignition switch OFF
P0100, P0102 and P0103 Mass Air Flow (MAF) Meter ECM calculates ignition timing in accordance with engine RPM and throttle valve position Pass condition detected
P0110, P0112 and P0113 Intake Air Temperature (IAT) Sensor ECM estimates IAT to be 20°C (68°F) Pass condition detected
P0115, P0117 and P0118 Engine Coolant Temperature (ECT) Sensor ECM estimates ECT to be 80°C (176°F) Pass condition detected
P0120, P0122 and P0123 Throttle Position (TP) Sensor ECM cuts fuel intermittently Pass condition detected and ignition switch OFF
P0121 TP Sensor ECM cuts fuel intermittently Pass condition detected and ignition switch OFF
P0327 and P0328 Knock Sensor ECM sets ignition timing to maximum retard Ignition switch OFF
P0351 to P0354 Igniter ECM cuts fuel Pass condition detected
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.