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actually i dont know. My CEL is not on and I went to Autozone today to see why my car is acting up, they hooked up the scanner and it showed it passing. Go figure. I think it is the DPFE sensor going bad
 

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Devil's Advocate. Just to cheese you off.
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for many items, CELs arent thrown untill the fault is recorded on two consecutive trips. Trips are defined as periods of sustained operation in excess of 5 minutes.
 

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A fault code it only thrown for an emissions code or if another controller (ie...TCM) requests it to be turned on.

to the computer, a trip is defined as when a vehicle fits into a certain set of parameters...there is often a timer involved but there are also many other factors like engine speed, MAP voltage, that fit into a set of code enable conditions.

all codes that turn the lamp on are two-trip codes meaning the fault must occur twice in different enabling checks and they stay in memory for 40 vehicle drive cycles. the first time it fails it sets a pending code and the lamp lights the second time.

the exception for this is the misfire monitor that sets a lamp and a code immediately and stays in memory for 80 cycles.
 
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