C3912 Mercedes Clk 230 OBD Code

OBD/2 C3912 error code description and symptoms.

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

C3912 Mercedes Clk 230 Error Code Repair Process :

If your front sounder circuit short to vbatt check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system C3912 and engine control unit are in charge of monitoring a bunch of different front sounder circuit short to vbatt, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Mercedes Clk 230 C3912 OBD2 Code

A common cause of code C3912 is the failure of Front Sounder Circuit Short to Vbatt, but there are several other possible causes as well, such as ;

Exhaust tube
Faulty TCM or TCM programming
Camshaft advance mechanism binding (VCT unit)
Variable Valve Timing (VVT) circuit is open or shorted

C3912 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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C3912 Mercedes Clk 230 OBD Code

C3912 Mercedes Clk 230 Error Code Repair Process :

Common Causes of Mercedes Clk 230 C3912 OBD2 Code

C3912 code for other Mercedes cars