C1925 Diagnostic Trouble Code

C1925 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 C1925 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. 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.

Process Tips

Diagnostic trouble code C1925 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 C1925.

Fortunately, C1925 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1925 Trouble Code For Specific Cars

C1925 Eagle Vision Incorrect Module Design Level
C1925 Cadillac Solitaire Dim Panel Increase Input Circuit Short To Ground
C1925 Mitsubishi Mum Aux A/C Mode Position Reference Circuit Short to Ground
C1925 Tvr Tina Power Steering Pressure Sensor Circuit High Input
C1925 Zender Escape SCP (J1850) Lack of Acknowledgment for Audible Warnings
C1925 Buick 70 Cylinder 4 Injector Circuit Low
C1925 Guy V8 Passenger Side Airbag Fault