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 Suzuki Sc100 Mirror Driver Left Circuit Open
C0291 Peugeot Vroomster Engine Oil Temperature Sensor High
C0291 Subaru B9 Left Front Center Sensor Circuit Failure
C0291 Mazda Roadster 4x4 Low Switch Error
C0291 De Tomaso Longchamp Hydraulic Base Brake Failure
C0291 Zaz Jalta SCP (J1850) Invalid or Missing Data for Vehicle Speed Control
C0291 Volvo V40 SCP (J1850) Invalid or Missing Data for Exterior Environment