C1478 Diagnostic Trouble Code

C1478 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 C1478 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 :

Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. 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.

Process Tips

Diagnostic trouble code C1478 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 C1478.

Fortunately, C1478 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1478 Trouble Code For Specific Cars

C1478 Datsun 120 Heater Coolant Temp sensor circuit Open
C1478 Ferrari Dino Interior Lamp Override Switch Short to Ground
C1478 Benz 11 Blower Fan Speed Circuit Range/Performance
C1478 Grant Grant Passenger Power Window Motor Circuit Short To Battery
C1478 Mercury Roadster Air Suspension Rear Pneumatic Failure
C1478 Spyker C12 Lamp Dome Input Circuit Open
C1478 Audi Rs5 ASM Mode Circuit Intermittent