C0894 Diagnostic Trouble Code

C0894 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C0894 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Dirty air cleaner element Damaged DPF

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code C0894 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C0894.

Fortunately, C0894 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0894 Trouble Code For Specific Cars

C0894 Smart Brabus Lamp ABS Warning Output Circuit Failure
C0894 Renault Avantime Gear Shift Foward Actuator Circuit Low
C0894 Volvo 240 SCP (J1850) Invalid or Missing Data for Digital Audio Tape
C0894 Mercedes Vaneo Air Bag Driver Circuit Resistance Low or Shorted Together
C0894 Nissan S-cargo Cruise Control Accel Signal Malfunction
C0894 Bentley R-type Battery Temp out of Range
C0894 Rolls-royce Silver Wraith Idle Air Control System At Adaptive Clip