C1958 Diagnostic Trouble Code

C1958 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 C1958 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Now, clear the codes and test-drive the vehicle to see if the code is reset. 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. 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 C1958 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 C1958.

Fortunately, C1958 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1958 Trouble Code For Specific Cars

C1958 Puma Gt Fuel Temperature Sensor #1 Circuit Short to Battery
C1958 Graf Und Stift Sp Passenger Door Unlock Switch Circuit Shorted to Ground
C1958 Maserati 450 Transmission Fluid Pressure Sensor/Switch A Circuit High
C1958 Daimler Daimler Headlamp Aim Output Relay Circuit Failure
C1958 Toyota Crown O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
C1958 Holden Vq
C1958 Ram 1500 Fuel Temperature Sensor A Circuit Performance