2000 Porsche Boxster (986) F6-2.7L A L L Diagnostic Trouble Codes ( DTC ): P Code Charts Page 651

Diagnosis conditions

- Mixture adaptation performed with the Porsche System Tester 2

Possible fault cause

- Incorrect signal from MAF sensor

- Intake air system leaking

- Fuel pressure too low

- Volume supply of fuel pump too low

- Fuel injectors fouled

Diagnosis/Troubleshooting

NOTE: Air leaks ahead of the oxygen sensors can lead to a fault in adaptation.

Part 1

Part 2

P1145

Oxygen Sensor Ahead of TWC, Bank 1 - Above Limit

Diagnosis conditions

NOTE: A lot of time is required (several days) until a fault is detected.

Possible fault cause

- Valve lift fault

- False air on the oxygen sensor after TWC

- Oxygen sensor

NOTE:

- As this fault can be caused by a faulty flat-base tappet, a system test for a small lift has to be performed initially. The fault can occur

sporadically; the test should therefore be performed at least three times when the engine is at operating temperature.

- First indication of a valve lift fault can be provided by the adaptation values at idle speed (RKAT) and in the lower part load (FRAU) if they

differ by more than 10 %.

Perform system test for small lift

WARNING: Test is carried out while driving. Have a second person operate the Porsche System Tester 2.

PORSCHE