P03BC Mercedes S 550 OBD Code

OBD/2 P03BC 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 long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

P03BC Mercedes S 550 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine P03BC light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If fuel rail sensor in-range low failure so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the fuel rail sensor in-range low failure.

Common Causes of Mercedes S 550 P03BC OBD2 Code

A common cause of code P03BC is the failure of Fuel Rail Sensor In-Range Low Failure, but there are several other possible causes as well, such as ;

Exhaust tube
Damaged VCT phaser
Faulty Intake Valve Timing Control Solenoid Valve
Starting system circuit Dead (Weak) battery

P03BC is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

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

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P03BC Mercedes S 550 OBD Code

P03BC Mercedes S 550 Error Code Repair Process :

Common Causes of Mercedes S 550 P03BC OBD2 Code

P03BC code for other Mercedes cars