U1985 Mercedes Sl 65 OBD Code

OBD/2 U1985 error code description and symptoms.

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

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.

U1985 Mercedes Sl 65 Error Code Repair Process :

If your air bag safing sensor 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 U1985 and engine control unit are in charge of monitoring a bunch of different air bag safing sensor 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 Sl 65 U1985 OBD2 Code

A common cause of code U1985 is the failure of Air Bag Safing Sensor Output Circuit Short To Ground, but there are several other possible causes as well, such as ;

Dirty Oil
Faulty front heated oxygen sensor
Clogged or faulty fuel injector (s)
Incorrect fuel filler cap used

U1985 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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U1985 Mercedes Sl 65 OBD Code

U1985 Mercedes Sl 65 Error Code Repair Process :

Common Causes of Mercedes Sl 65 U1985 OBD2 Code

U1985 code for other Mercedes cars