WHY DOES THE ENGINE CHECK LIGHT GOES ON AND OFF STAY ON OFF IN A CHRYSLER TOURING 2007

Hi there,

Your vehicle's OBD computer monitors all your vehicle's electrical emission circuits.

Each time you turn your key, the computer considers this 1 x drive cycle.

When a fault (or out of spec) condition occurs, this will register a fault code in the computer's memory. Some circuits will only trigger the Check Engine Light (CEL) after the same fault occurs a few times. Other circuits will trigger the CEL with just one fault detection.

In the same manner, if the fault condition is only intermittent, the computer may consider the condition recitified, if that fault does not occur after several drive cycles (i.e. the CEL will no longer light up).

The only way to have this resolved is to arrange for your local Mercedes dealership (or authorised service agent) to connect their factory SCAN TOOL.....and read your computer's stored fault codes.

These fault codes will quickly identify the suspected circuits (eliminating unnecessary garage labor costs), allowing quick diagnosis & repair.

Note: Mercedes Scan Tools operate on a different communication protocol. Typical scan tools designed for American & Japanese vehicles use a different protocol, therefore, I recommend this be done only by a Mercedes agent (or European service specialist).

The process of scanning for fault codes only takes 15-25mins (depending on the technician's experience), hence should not cost you much to have this procedure performed.





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