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IAT sensor not working, any damage on engine?


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mytiguan
New User

Aug 1, 2012, 4:08 AM

Post #1 of 4 (11177 views)
IAT sensor not working, any damage on engine? Sign In
Hello,

The OBD Check Engine indicator lighted up last week on my 2012 Tiguan 2.0, dealer told me the Intake Air Temperature sensor has failed, and part delivery from VW could take 10 days.

I've driven about 50km since the problem first showed up, symptoms are full speed (and very loud) radiator fan and increased fuel consumption. I have not noticed any power loss.

My questions are, does the increased fuel consumption indicate a richer air/fuel ratio? Would driving with a bad IAT sensor damage the engine? This is my new car with only 900km done.

Thank you!


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Aug 1, 2012, 4:50 AM

Post #2 of 4 (11161 views)
Re: IAT sensor not working, any damage on engine? Sign In
The intake air temperature sensor or IAT is used by the engine control module (ECM) to calculate the temperature of the incoming air into the engine. The ECM uses the air intake temperature to fine tune the amount of fuel going into the engine and ignition timing. The IAT may also be used to keep the ac compressor from engaging if it is too cold outside.

Some IATs are part of the MAF sensor and others may be located separately in the ducting going to the throttle body.

An unplugged IAT won't damage the engine, but may cause increased fuel consumption and various drive-ability problems.





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mytiguan
New User

Aug 1, 2012, 5:04 AM

Post #3 of 4 (11154 views)
Re: IAT sensor not working, any damage on engine? Sign In
In Reply To
The intake air temperature sensor or IAT is used by the engine control module (ECM) to calculate the temperature of the incoming air into the engine. The ECM uses the air intake temperature to fine tune the amount of fuel going into the engine and ignition timing. The IAT may also be used to keep the ac compressor from engaging if it is too cold outside.

Some IATs are part of the MAF sensor and others may be located separately in the ducting going to the throttle body.

An unplugged IAT won't damage the engine, but may cause increased fuel consumption and various drive-ability problems.
Thank you!!! It's relieving to know this issue won't crapout my engine.


nickwarner
Veteran / Moderator
nickwarner profile image

Aug 1, 2012, 6:53 PM

Post #4 of 4 (11109 views)
Re: IAT sensor not working, any damage on engine? Sign In
Thats right, it won't crapout your engine. Its actually doing this to protect it. Your ECM calculates how much fuel to deliver based on readings it gets from its various sensors. If it detects a fault with one of the sensors that it relies upon for data it will go into a conservative mode. While it does give you less power and lower fuel economy, its doing so to protect your engine from damage until it can receive the proper data.





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