Restored to Stock Tune, Got code PO111 - Mustang Evolution

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Old 04-05-2016, 11:37 AM   #1
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Restored to Stock Tune, Got code PO111

I re-installed the factory airbox and restored factory program on my '14 Cyclone last night, took a 45 minute drive, all was fine. This morning she's throwing a code PO111, something to do with the intake air temp sensor. Anybody else ever have this? I've been trying to get her to pass inspection for 3 weeks, Steeda custom tune apparently bypassed O2 and Catalyst sensors for some reason, so we could not get O2, O2 heat and Catalyst sensors to set, mechanic said it had to be the tune. She's under 15K miles, with BBK Shorty Headers and BBK 73mm T/B and FRPP Axle Backs, beyond that she's stock. Kept in garage, Engine bay kept clean, no corrosion on connections (which were all unplugged/reconnected last night). Any suggestions?
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Old 04-06-2016, 09:35 AM   #2
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You might have damaged the sensor, it is very delicate. You have to be careful and not hurt the little wire in it. It might not be seated good to. The sensor could be bad also. Here is a list of things that might be wrong


P0111 - OBD-II Trouble Code | BestRide.com
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Old 04-06-2016, 09:55 AM   #3
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Thanks, but turned out to be a 'calibration soak' thing thankfully. Cleared the code, all is well.
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Old 04-07-2016, 09:31 AM   #4
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What is a calibration soak? And how did you fix the issue? Would like to get some knowledge
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Old 04-07-2016, 10:09 AM   #5
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Calibration soak

As I understand from the article I read, when the ECU is initially flashed, it performs calibration functions for approximately 8 hours after you shut the engine down. When you start it up after that "soak" time it compares the intake air temp and the coolant temp, if there is too much difference between the two it codes PO111, which indicates a potential problem with the IAT sensor. Monday morning there was a 20 degree change from my garage to the driveway, hence the temp deviation. I cleared the code and it has not returned.
After the initial calibration, anytime the battery is disconnected, it goes thru another 'Calibration soak', but now, it's only 6 hours, so under similar conditions it's possible to throw a code; if that code is due to this Calibration soak' (I wonder who came up with that term?) clearing the code should be all that's needed.
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Old 04-07-2016, 01:11 PM   #6
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Learn something today. Thank you guys.
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Old 04-08-2016, 09:42 AM   #7
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Thank you for the explanation!!!

Quote:
Originally Posted by DrDave View Post
As I understand from the article I read, when the ECU is initially flashed, it performs calibration functions for approximately 8 hours after you shut the engine down. When you start it up after that "soak" time it compares the intake air temp and the coolant temp, if there is too much difference between the two it codes PO111, which indicates a potential problem with the IAT sensor. Monday morning there was a 20 degree change from my garage to the driveway, hence the temp deviation. I cleared the code and it has not returned.
After the initial calibration, anytime the battery is disconnected, it goes thru another 'Calibration soak', but now, it's only 6 hours, so under similar conditions it's possible to throw a code; if that code is due to this Calibration soak' (I wonder who came up with that term?) clearing the code should be all that's needed.
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