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2004 Mercedes-Benz C230 Question: How do I resolve the check engine light for a mass air flow sensor.

 

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miec, Denver, CO, January 30, 2012, 10:33
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I replaced the mass air flow sensor, but I still get the same engine code. Could there be another issue?

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  • Answer #1

    raiderron January 30, 2012, 20:58
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     Master

    The check engine light pointing at the mass air flow sensor circuit is just that. The circuit. It could be the sensor or any wiring in between or the sensor driver in the computer. Just randomly changing parts is never a gaurantee fix.

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    miec, February 11, 2012, 13:09
     Rookie

    I checked the wiring between the sensor and the ecm. It all test fine. What else might it be?

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    raiderron, February 11, 2012, 14:24
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    As I stated before it could be a problem with the internal driver in the ECM. Would need qualified tecch to inspec t and are you saying you LOOKED at the wiring or did you verify continuity with a DVOM and inspect for grounding problems and insulation rub thru problems? Connector at the sensor could have bad prongs or a prong pushed back into the connector. Have it running and then wiggle the wires/connector and see if light flickers. Step by step by step......

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    miec, February 11, 2012, 16:51
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    I did verify continuity with a DVOM, inspected all insulation and prongs on sensor and ecm connector. I took apart the head of the ecm connector and inspected all connections. All looked and tested good. So you are saying a faulty internal driver in the ecm could give a single check engine code 0110 related to the combination MAF/IAT and nothing else?

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    raiderron, February 12, 2012, 09:09
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    Yes it could. As I said, a qualified tech needs to look at it and attach some testing equipment and pinpoint the problem. Sometimes you can get a bad new part, also. The CEL is for the entire circuit.

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    miec, February 12, 2012, 09:55
     Rookie

    Is there a way to check the sensor so as I can eliminate any questions of a faulty part? The actual codes is 0110 which corresponds to the IAT.

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