U2140 Mercedes-benz W136 OBD Code

OBD/2 U2140 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.

At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.

U2140 Mercedes-benz W136 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U2140 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 interior fan control circuit short to ground 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 interior fan control circuit short to ground.

Common Causes of Mercedes-benz W136 U2140 OBD2 Code

A common cause of code U2140 is the failure of Interior Fan Control Circuit Short to Ground, but there are several other possible causes as well, such as ;

Exhaust tube
Faulty Crankshaft Position Sensor (POS)
Engine Control Module (ECM)
Camshaft advance mechanism binding (VCT unit)

U2140 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

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

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U2140 Mercedes-benz W136 OBD Code

U2140 Mercedes-benz W136 Error Code Repair Process :

Common Causes of Mercedes-benz W136 U2140 OBD2 Code

U2140 code for other Mercedes-benz cars