C0134 Diagnostic Trouble Code

C0134 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 C0134 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Dirty air cleaner element Damaged DPF

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. Now, clear the codes and test-drive the vehicle to see if the code is reset. 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 C0134 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 C0134.

Fortunately, C0134 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0134 Trouble Code For Specific Cars

C0134 Mercedes-benz Vaneo Air Suspension Height Sensor Power Circuit Failure
C0134 Db Coach HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
C0134 Lawil A System Too Lean (Bank 1)
C0134 Fiat 70 Lamp Dome Input Circuit Failure
C0134 Mazda Mazdaspeed Turbocharger Boost Sensor A Circuit Range/Performance
C0134 Cadillac 75 Damper RR Circuit Failure
C0134 Fnm 2150 Left Rear Stop lamp Circuit Short to Battery