Input air sensor reading +40 OBD2

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Jun 13, 2021 | 05:13 AM

Matto1965

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Joined: May 2021

Posts: 49

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From: Hobart

Input air sensor reading +40 OBD2

Hi all I bought a new OBD2 and it reads better on x300 4.0na . I see now that my IAT is reading +40 c. Unplugged I get -40 c. I put a potentiometer in line to increase resistance and got -18 c turn pot and got -19/20. I am assuming that my IAT is fried. Any thoughts?

Jun 13, 2021 | 06:59 AM

Vee

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Joined: May 2010

Posts: 5,348

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From: Arlington, VA

Yup. I would think that would need to be replaced. Easy and cheap.

How's the coolant temp sensor? You may want to got 2-0 on cheap and easy....

Jun 13, 2021 | 12:06 PM

Parker 2

Senior Member

Joined: Nov 2019

Posts: 545

Likes: 261

From: Kansas City

The inlet air temp and engine coolant temp sensors are thermistors that when unplugged are not powered as they should be

They can be calibrated against a chart on page 86 and 78 as your meter should be powering them if you use a 9 volt battery powered meter

http://www.jagrepair.com/images/Trai...20-%202000.pdf