C1074 Diagnostic Trouble Code

C1074 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 C1074 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Faulty IMRC actuator relay (if equipped)

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. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C1074 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 C1074.

Fortunately, C1074 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1074 Trouble Code For Specific Cars

C1074 Ford Torino Mirror Switch Assembly Circuit Short to Ground
C1074 Ford Aerostar LF LAMP LOW BEAM CIRCUIT Failure
C1074 Volvo S80
C1074 Toyota Corona O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
C1074 Seat Leon 2 Injector Control Pressure System Fault
C1074 Vector M 12 PRNDL Reverse Input Short Circuit To Ground
C1074 Vespa 400 Purge Flow Sensor Circuit Malfunction