C1111 Diagnostic Trouble Code

C1111 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 C1111 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Faulty IMRC actuator/sensor

Repair Processes :

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. 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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code C1111 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 C1111.

Fortunately, C1111 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1111 Trouble Code For Specific Cars

C1111 Toyota Highlander Oil Level Lamp Circuit Failure
C1111 Chevrolet Sonic Electric Air Pump Primary Failure
C1111 Hotchkiss Gregoire Ride Control LR Shock Actuator Circuit Failure
C1111 Osca Mt Door Unlock Disarm Output Circuit Short To Battery
C1111 Suzuki Grand Vitara
C1111 Nissan Grand Clutch Position Sensor Circuit Malfunction
C1111 Nsu Ro80 Cylinder 12 Contribution/Balance Fault