C1920 Diagnostic Trouble Code

C1920 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 C1920 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Reduction in engine performance, especially at low RPM levels

Possible Causes :

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.
Some aftermarket accessories and performance modifications
Faulty IMRC actuator/sensor

Repair Processes :

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. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code C1920 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 C1920.

Fortunately, C1920 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1920 Trouble Code For Specific Cars

C1920 Opel Ampera Damper RR Circuit Failure
C1920 Nissan Az-1 Climate Control On/Off Switch Circuit Failure
C1920 Holden Jd Power Steering Failure
C1920 Lamborghini Flying Star Shift/Timing Solenoid High
C1920 Moretti 128 Battery Temp out of Range
C1920 Ford Explorer V Memory Off Switch Circuit Short to Battery
C1920 Nsu Sports Cylinder 12 Injector Circuit Low