P0111 error code - air intake temperature

[Mightymetro]

I’ve finally cleared some of the error codes showing that was a bad lambda sensors and I’m now left with p0111 which is the air intake temperature 

it normally does it after about 10 minutes driving.

 

if it was a short in the wiring I would have thought it would ping the EML straight away

 

anyone had anything similar ?

[steve930]

Do you still have the EGR system installed & functioning, or has it been blanked off? 

[Mightymetro]

I think I still have it all working, I believe just the secondary air has been removed

 

new faster reading intake sensor has arrived........but the light was reset and now won’t come back on 😂😂😂

[Mightymetro]

Bit more on this

 

the EML kept pinging p0111 5/10 mins into driving so i changed the IAT sensor and then ended up with it lit permanently .  I noticed the pins on the plug looked a bit corroded so I have replaced the plug with a new one and this cleared the code and it stayed off for the last 500 miles while running the engine in

however, now I have started exploring more of the Rev range the EML will not light up but 5 seconds into a spirited run above 5000rpm and it comes on.  Reset it and the same again, can drive around below this with no codes.  As soon as I stretch her legs it pings on and still shows the code p0111

ive run the scan software and it shows min IAT at 36 degrees and max at 83 degrees.  It won’t ever get above this due to the EML light coming on

on reading the code using the V8 scan tool the freeze frame feature doesn’t seem to store the MAT and MAP values.  My current thought is that I maybe have a earth related resistance problem and that the biter the intake temp the higher the resistance but then eventually it breaks down due to the corroded wire resistance.  Does this sound at all logical

 

[mike_sekinger]

You don't have any EGR or SAI fitted.  The EGR manifold is blocked, but the temperature sensor should still be connected electrically.

Since you are also experiencing modest boost, I would focus on the signal ground and resistance in the loom itself.  Are you sure that the new sensor has the same characteristics as the stock sensor?  I know that you also had the problem with the old sensor, but 83 deg seems awfully high for such modest boost.

[sailorbob]

Is the IAT sensor showing the ambient air temperature when the engine is cold? If it's showing the 36 deg C you referred to then the sensor, wiring or ECU is faulty.