Diagnosis Procedure
1 Road test vehicle or perform short test.
1. Erase the fault memory.
2. Heat the oxygen sensors (road test car under load or run engine for 10 minutes without load at high rpm).
3. Road test vehicle or perform short test, ensuring that the diagnosis conditions are reached.
4. Read out the fault memory.
2 Read out regulator delay after TWC, banks 1 and 2.
Read out regulator delay with Porsche System Tester 2 or sensor characteristic shift with a scan tool in Mode 5.
Display: less then 1.2 or greater then 1.2 sec.
P1276
P1276
Signal Delay Time for Oxygen Sensor Ageing, Bank 2 - Above/Below Limit
Function
The diagnosis of "oxygen sensor ageing helps to identify oxygen sensors ahead of TWC that lead to emission limits being exceeded because of