Way to Test Air Mass Sensor Off-Engine? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 10-31-2009, 12:07 PM Thread Starter
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Way to Test Air Mass Sensor Off-Engine?

2003 C230 Kompressor, had check engine light, did online research, gambled that air mass sensor (mass air sensor?) was bad. Wrong guess: cost of part plus $200 labor later, still CEL. Turned out to be a valve guide/seat problem on cylinder #1, nothing to do with any sensors.

So am now trying to sell my original, apparently still just fine sensor. Have a prospect but he justifiably would like some assurance from me that the old sensor is still good. (Only has 47k miles on it and was NOT the cause of my CEL, so I presume it is, but in his position I'd want more of a guarantee than that myself).

Anybody know a way to test the used sensor without having to put it back on the car?
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post #2 of 7 (permalink) Old 11-01-2009, 05:59 AM
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What are the codes?

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post #3 of 7 (permalink) Old 11-01-2009, 08:20 AM Thread Starter
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Over the course of several weeks of diagnosis, the codes encountered included P201A/B, P0301, P2029, and P202A. Message was always "misfire on cylinder #1." After much research here and elsewhere I took a gamble and bought a new air mass sensor and had it installed. Within a couple days, though, the Check Engine Light came on again and it was back to the shop. Thousands of bucks later it turned out I had a valve guide/seat issue and had to replace the cylinder head, nothing at all to do with any sensors.

So now I have the original air mass sensor sitting on my workbench, presumably still good (only has 47k miles on it), and someone is willing to buy it but would like me to test it somehow. Putting it back on the vehicle is not a practical solution, labor alone for that is $200. Just wondering if there is some electronic test than can be done on the sensor off-engine to reassure my potential buyer that the used sensor is still good.
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post #4 of 7 (permalink) Old 11-01-2009, 08:44 AM
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Putting MAF on vehicle is 90 seconds job.
Paying for the job $200 is another story.
Low mileage on MAF means nothing. They just fail occasionally. Meaning sounds like you are stuck with spare MAF.
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post #5 of 7 (permalink) Old 11-01-2009, 08:45 AM
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I posted a Bosch spec sheet for MAf value bench testing in the 210 forum, it's in the engine stickies and I believe it is applicable to all late model MB.

Good luck.

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post #6 of 7 (permalink) Old 11-01-2009, 11:15 AM Thread Starter
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I searched both 210 forums every way I could think of but couldn't find this. Can you point me in more detail?

Oops, never mind, found it. Way over my head, but found it!

Last edited by judyeray; 11-01-2009 at 11:53 AM. Reason: OBE
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post #7 of 7 (permalink) Old 11-01-2009, 11:18 AM Thread Starter
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Not 90 seconds for me! I downloaded some good pictorial directions and it looked like maybe 20-30 minutes if all goes well, but halfway through it also called for a special tool. But I suspect "I reinstalled it and didn't get a CEL" wouldn't satisfy the guy who's considering buying it. I was hoping there was a bench test where one could just check voltages or resistances or whatever.

Last edited by judyeray; 11-01-2009 at 11:19 AM. Reason: Typo
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