P1416 Fault - Data sampling puzzle
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Joined: May 2001
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From: USA
P1416 Fault - Data sampling puzzle
I recently swapped from my "high performance" intake air temp sensor back to my stock sensor after a year of operation on the "hi perf" sensor. DIC displayed a P1416 AIR Bank 2 fault within 24 hours. The fault remained current for two weeks. I cleared the fault several times but it always returned within 24 hours. After the two weeks I switched back to the "hi perf" sensor and within 24 hours the P1416 fault cleared and has not returned after several weeks. This prompts a question: Does anyone know exactly what sensors are sampled and what measurements are observed that compel the engine control module to declare a P1416 fault and flag it in the system error log? Until now I had assumed it was an oxygen content delta between the left and right banks as measured at the forward o2 sensors. Involvement of the IAT sensor is not intuitive and has me pondering. Please share some insight if you have any.
Le Mans Master
Joined: Jul 1999
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From: jackson nj
Re: P1416 Fault - Data sampling puzzle (jorex)
The P1416 code is for the AIR check valve behind the intake manifold, how or why it would relate to your intake air temp sensor is a puzzle to me. I would recommend putting the stock one back on and taking the car to a dealer, provided you still have warranty on it.
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From: USA
Re: P1416 Fault - Data sampling puzzle (Red98C5)
Thanks for the being the only brave soul to venture an answer. I can't dispute that the AIR valve can cause the fault, but the AIR valve has no sensor in it. So how does the computer come to the conclusion that it may be bad? The computer can only use data from the sensors it has. So which ones does it read and what values does it see that make it conclude the P1416 fault is occurring? Too much o2 in the exhasust stream? Not enough? Either one? Maybe the intake air temp is part of a more complex calculation to predict total o2 measured at the sensor and when the actual measurement has significant delta from the prediction, the computer just kicks the generic P1416. Maybe there is an OBDII spec book that explains it all.
