P1678 DTC For Porsche Cayman Type 987

Your Porsche Cayman Type 987 engine control system detects a problem, the computer stores the diagnostic trouble code P1678 in its memory. To figure out what is wrong with your vehicle you must first extract the P1678 DTC For Porsche Cayman Type 987.

On 1999 and later P1678 Porsche Cayman Type 987 engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.

If your vehicle failed a P1678 Porsche Cayman Type 987 test and the P1678 Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses P1678 a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look P1678 DTC For Porsche Cayman Type 987: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.

P1677 DTC (Previous DTC Code)

( Next DTC Code ) P1679 DTC

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