C1817 Diagnostic Trouble Code

C1817 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 C1817 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
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.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. 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.

Process Tips

Diagnostic trouble code C1817 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 C1817.

Fortunately, C1817 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1817 Trouble Code For Specific Cars

C1817 Morris Ten Four Cam Calibration Fault
C1817 Porsche 959 Fuel Level Sensor B Circuit Malfunction
C1817 Borgward 1800 Control Module Programming Error
C1817 Vegantune Evante PSD Not Fully Closed During Self-Test
C1817 Lotus 33 Torque Converter Clutch Solenoid Failed On
C1817 Dodge Sprinter Ignition Start Circuit Failure
C1817 Saab 96 Ignition Tach Circuit Failure