B1689 Mercedes E 290 OBD Code

OBD/2 B1689 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 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.

B1689 Mercedes E 290 Error Code Repair Process :

If your b1689 autolamp delay circuit failure 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 B1689 and engine control unit are in charge of monitoring a bunch of different b1689 autolamp delay circuit failure, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Mercedes E 290 B1689 OBD2 Code

A common cause of code B1689 is the failure of B1689 Autolamp Delay Circuit Failure, but there are several other possible causes as well, such as ;

Dirty Oil
1Camshaft Position Sensor circuit poor electrical connection
Faulty TCM or TCM programming
Three way catalyst converter Bank 1

B1689 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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B1689 Mercedes E 290 OBD Code

B1689 Mercedes E 290 Error Code Repair Process :

Common Causes of Mercedes E 290 B1689 OBD2 Code

B1689 code for other Mercedes cars