B003A Mercedes Cl 420 OBD Code

OBD/2 B003A 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.

B003A Mercedes Cl 420 Error Code Repair Process :

The scent may B003A signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such B003A, so if the inside of your car o2 sensor circuit malfunction (bank 1 sensor 3) as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Common Causes of Mercedes Cl 420 B003A OBD2 Code

A common cause of code B003A is the failure of O2 Sensor Circuit Malfunction (Bank 1 Sensor 3), but there are several other possible causes as well, such as ;

Exhaust tube
Faulty Crankshaft Position Sensor (POS)
Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
Engine Control Module (ECM)

B003A is a kind of Body Trouble Code

Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

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

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B003A Mercedes Cl 420 OBD Code

B003A Mercedes Cl 420 Error Code Repair Process :

Common Causes of Mercedes Cl 420 B003A OBD2 Code

B003A code for other Mercedes cars