C1331 Diagnostic Trouble Code

C1331 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 C1331 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Faulty IMRC actuator/sensor

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code C1331 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 C1331.

Fortunately, C1331 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1331 Trouble Code For Specific Cars

C1331 Acura Nsx ABS Inlet Valve Coil LF Circuit Open
C1331 Dodge Avenger
C1331 Chevrolet Lumina ECU Is Defective
C1331 Lamborghini Diablo Shift Time Too Long
C1331 Rover 3-litre Ignition Coil A Primary/Secondary Circuit Malfunction
C1331 Premier Padmini Fuel Rail Pressure Sensor Circuit Intermittent
C1331 Saab Gt Ignition Tamper Circuit Short To Battery