C0251 Diagnostic Trouble Code

C0251 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 C0251 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the 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. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code C0251 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 C0251.

Fortunately, C0251 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0251 Trouble Code For Specific Cars

C0251 Gmc Terra Park Brake Switch # 2 Applied Circuit Short to Gnd
C0251 Paykan 1600 Driver Window Down Current Sense Low Circuit Failure
C0251 Simca 1307 Intake Manifold Runner Control Circuit Malfunction
C0251 Fiat Campagnola Lamp Headlamp Low-Beam Circuit Short To Battery
C0251 Kia M-car Seatbelt Driver Pretensioner Circuit Open
C0251 Humber Super Snipe Right Rear Turn Lamp Circuit Short to Battery
C0251 Nissan Versa Cylinder #5 High To Low Side Short