U1866 Mercedes S 560 OBD Code

OBD/2 U1866 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.

To check for an open circuit, trace along the length of the transmission control circuit, checking for breaks in the wiring. Repair any broken wiring and make sure all connectors are fully seated and locked.Pay close attention to connectors, looking for corrosion, bent or broken pins, or moisture in the connector. Repair any connector issues even if they are not specifically part of the transmission control circuit as they may serve a function in providing power to the transmission control circuit.

U1866 Mercedes S 560 Error Code Repair Process :

If your lamp tail output circuit short to ground 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 U1866 and engine control unit are in charge of monitoring a bunch of different lamp tail output circuit short to ground, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Mercedes S 560 U1866 OBD2 Code

A common cause of code U1866 is the failure of Lamp Tail Output Circuit Short To Ground, but there are several other possible causes as well, such as ;

Exhaust tube
Faulty front heated oxygen sensor
Ignition coils circuit poor electrical connection
Faulty Intake Valve Timing Control Solenoid Valve

U1866 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.

About Us | Contact | Privacy

U1866 Mercedes S 560 OBD Code

U1866 Mercedes S 560 Error Code Repair Process :

Common Causes of Mercedes S 560 U1866 OBD2 Code

U1866 code for other Mercedes cars