One Porsche 997 2009 year with 52 thousands KM, the driver owner described: the check engine light always on.This article share the way to reset Porsche 997 Engine light on.
Trouble diagnosis: I connect Piwis Tester II to the vehicle and read out these trouble codes:
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P0171: System too Lean (Bank 1)
P2195: O2 Sensor Signal Stuck Lean Bank 1 Sensor 1
P2414: O2 Sensor Exhaust Sample Error Bank 1 Sensor 1; V424 received from the HVAC control unit data is invalid; V0101 Communication transmission control unit.
P1628: Transmission control unit communication
P1619: Communication transmission control unit
Read out the real data: as the real data described, the O2 Sensor Bank 1 display mixture too lean, the fuel close to idling of Bank 1 correct adapt (RKAT) to 3%, O2 Sensor 1 still display mixture too lean (as the following table shows), so the control unit display the above-mentioned trouble codes.
Table 1
| Serial Number | Data | Range | Before repair | After repair |
| L010 | Fuel Correction Average Value | Bank 1 | 13.5% | -1%-0.8% |
| L020 | Fuel Correction Average Value | Bank 2 | -0.97%~0.91% | -1%~0.29% |
| L070 | O2 Sensor | Bank 1 | 2.8v/0.4v | 2v/0.7v |
| L080 | O2 Sensor | Bank 2 | 1.9v/0.4v | 2v/0.6v |
| L300 | RKAT | Bank 1 | 3.49% | 0.35% |
| L310 | RKAT | Bank 2 | -0.25% | 0.29% |
| L320 | FRAU | Bank 1 | 2.00% | -3.23% |
| L330 | FRAU | Bank 2 | -4.14% | -2.53% |
| L340 | FRAU | Bank 1 | 0.00% | -0.17% |
| L350 | FRAU | Bank 2 | -3.78% | -0.13% |
| HO10 | Intake air | 19.3kg/h | 14.4kg/h | |
| Throttle opening degree | 3 | |||
| H040 | correction factor | -3.4%~9.2% | 9.5% |
Trouble code reset: after changing O2 Sensor Bank 1 Sensor 1, the trouble code is reset