FAILURE MODE EFFECTS MANAGEMENT
(FMEM) CODE 998
FMEM mode allows system operation when sensors fail or transmit signals that are out of normal operating range. During FMEM mode, PCM substitutes a mid-range signal for defective sensor while continuing to monitor sensor. If faulty sensor's signals return to normal operating range, PCM will use those signals. A Code 998 will be displayed when FMEM mode is in effect.
Disonnecting the MAF etc could have triggerred this. Clear the code and retest and see what code comes up.
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Friday, October 19th, 2012 AT 5:48 PM