C1745 Diagnostic Trouble Code

C1745 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 C1745 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

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 :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. 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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C1745 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 C1745.

Fortunately, C1745 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1745 Trouble Code For Specific Cars

C1745 Ferrari 126 Injector Circuit Open / Shorted - Cylinder #6
C1745 Honda Thats Reverse Input Circuit
C1745 Mazda Axela Ii Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
C1745 Cottin-desgouttes 60 Fuel Stepper Motor Malfunction
C1745 Goliath 1100 Passenger Door Ajar Circuit Short To Battery
C1745 Saturn Curve
C1745 Mazda Spiano A/C Compressor Temperature Sensor Malfunction