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Old 07-12-17, 04:01 PM   #1
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Default MAF Sensor - is it this simple?

I recently bought a 207 SW HDI (90). It seems to run well with adequate power and is a good starter. I haven't donn enough miles to check the mpg though.

It always shows 'antipollution faulty' on star-up but never when running. The EM light is working but does not come on. A (cheap) EOBD reader reported 3 faults, including P0104 - MAF circuit intermittent. It would not clear this fault.

After several hours of reading on here I came across a short post by Bettyswallocks suggesting disconnecting the MAF Sensor to see if it causes a power reduction. I tried this and found it made no difference to the car's performance.

Presumably, I need to replace the MAF Sensor.

At the risk of sounding dense, is it really that simple?

Comments or opinions are most welcome. Thanks.
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Old 07-12-17, 04:12 PM   #2
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Oh yes, it is that simple!

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Old 08-12-17, 12:44 PM   #3
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Yes, you just have to debate whether to buy an original part (100) or a 30 Ebay OEM part.
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Old 09-12-17, 10:10 AM   #4
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Quote:
Originally Posted by Gibbo View Post
Yes, you just have to debate whether to buy an original part (100) or a 30 Ebay OEM part.
OK, I will give that some careful thought.... right, decision made - Ebay it is.

Thanks for your help.
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Old 12-12-17, 08:20 PM   #5
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So, 46 lighter but the MAF Sensor is replaced. Performance has definitely improved and (after I cleared the stored codes) the antipollution warning has not reappeared.

So thanks for the reassurances.

That just leaves the matter of code P1351 - IDM (Ignition Diagnostics Monitor) input circuit malfunction. I hope it is the pre-heat relay and/or power feed rather than the glowplugs.
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Old 12-12-17, 08:31 PM   #6
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P1351 is not always a fault it can be ignored if you have no DPF.
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Old 12-12-17, 09:35 PM   #7
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Quote:
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P1351 is not always a fault it can be ignored if you have no DPF.
Thanks for that. No DPF so no regen to worry about.

I thought the glow plugs still played a part in bringing the engine up to temperature from a cold start-up, or is this not relevant?

Also, could this fault code not point to one or more glowplugs not working, or even the relay?
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Old 13-12-17, 12:39 PM   #8
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Yep, plugs are used in post heating, depending on temperature.
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