C129E Diagnostic Trouble Code

C129E 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 C129E diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
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
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

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. 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.

Process Tips

Diagnostic trouble code C129E 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 C129E.

Fortunately, C129E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C129E Trouble Code For Specific Cars

C129E Mazda 360 Transmission Transfer Case Contact Plate 'C' Open Circuit
C129E Citroen C4 Front Wiper Select Switch "W" Short to Ground
C129E Audi A8 ANTI THEFT HORN OUTPUT CIRCUIT Short to Gnd
C129E Riley Elf Horn Relay Coil Circuit Short to Vbatt
C129E Bmw 7 Climate Control A/C Pressure Switch Circuit Failure
C129E Buick Roadmaster Cylinder Head Temp Sensor Out Of Self Test Range
C129E Fiat Coupe Lamp Keypad Output Circuit Failure