C0291 Diagnostic Trouble Code

C0291 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 C0291 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 :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code C0291 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 C0291.

Fortunately, C0291 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0291 Trouble Code For Specific Cars

C0291 Porsche Tapiro Fuel Rail Pressure Sensor Circuit High Input
C0291 Daimler Super Heated Backlite Relay Short To Battery
C0291 Mazda Revue 4-5 Shift Malfunction
C0291 Proton Waja Fuel Temperature Sensor #1 Circuit Failure
C0291 Chrysler Me Evaporative Emission Control System Purge Control Valve Circuit Open
C0291 Holden Fb Port Air Circuit Malfunction/ (AIR) System Bank 2
C0291 Kia Carens Seat Rear Vertical Motor Position Out of Range