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Can someone please advise which is the MAF sensor and which is the IAT sensor, are they seperate are combined. I am looking for the signal wires for each.

I have numbered some sensors I have found, if these are not the one(s) where do I look.

Please advise by number and wire colour

307 engine

Thanks

2005 307 1.6 110bhp turbo diesel
 

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Can't help on the wire colours but in your picture, 3 is the IAT sensor (I think!), 2 is the intake pressure sensor. 1 & 4 aren't sensors, they're butterfly valve controls. MAF sensor is in the pipe between the air filter housing and the turbo. Look at the right hand end of the engine cover, towards the back. Or follow the air hose back from the turbo towards the air filter.
 
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