OBD (II) - P0010 - P0199: P0040: Diagnosis/troubleshooting

NOTE: The oxygen sensors ahead of the catalytic converter can only be exchanged in naturally aspirated V8 engines. If this fault is recorded for a turbo V8 engine, however, it can only be caused by polarity reversal in the wiring harness (e.g. following accident repairs).

WARNING: Always observe the notes on possible dangers, the warning and caution notes as well as the general instructions in the introduction!!!

NOTE: Do not use contact spray on the oxygen sensor plug connections, as this may cause irreparable damage to the wiring (blocking the reference air channels).

NOTE: Do not confuse oxygen sensor ahead of catalytic converter and oxygen sensor behind catalytic converter as this will cause implausible fault entries.

Distinguishing feature of both sensors:

Oxygen sensor in front of catalytic converter (LSU) has a six-pin connector

Fig 1: Identifying Oxygen Sensor Six-Pin Connector

Courtesy of PORSCHE OF NORTH AMERICA, INC.

Oxygen sensor behind catalytic converter (LSF) has a four-pin connector

Fig 2: Identifying Oxygen Sensor Four-Pin Connector

Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE: The diagnosis detects contrary adaptation values for oxygen sensor. If the adaptation values reach the control limits in opposite directions, interchanged oxygen sensors will be detected.

WORK INSTRUCTION CHART

Work instruction			Display OK	If not OK
1	Check that wiring harness of oxygen sensors ahead of catalytic converter has not been interchanged. Observe color coding!		Go to step 2 -bank 1 or Go to step 2a -bank 2	Allocate the correct wiring harness to the correct oxygen sensor. Observe color coding! → End
2	Measure wires to oxygen sensor ahead of catalytic converter, bank 1	Remove connector A from DME control module Visual inspection Disconnect plug connection of both oxygen sensors ahead of catalytic converter Visual inspection Measure resistance between DME control module connector A, pin 5, and oxygen sensor ahead of catalytic converter, bank 1, pin 4 Measure resistance between DME control module connector A, pin 51, and oxygen sensor ahead of catalytic converter, bank 1, pin 5 Measure resistance between DME control module connector A, pin 52, and oxygen sensor ahead of catalytic converter, bank 1, pin 6 Measure resistance between DME control module connector A, pin 70, and oxygen sensor ahead of catalytic converter, bank 1, pin 1 Measure resistance between DME control module connector A, pin 71, and oxygen sensor ahead of catalytic converter, bank 1, pin 2	< 2 Ω Go to step 3	Eliminate the cause of the fault, restore correct line connection and allocate the correct wiring harness to the correct oxygen sensor. → End
2a	Measure wires to oxygen sensor ahead of catalytic converter, bank 2	Remove connector A from DME control module Visual inspection Disconnect plug connection of both oxygen sensors ahead of catalytic converter Visual inspection Measure resistance between DME control module connector A, pin 4, and oxygen sensor ahead of catalytic converter, bank 2, pin 4 Measure resistance between DME control module connector A, pin 12, and oxygen sensor ahead of catalytic converter, bank 2, pin 5 Measure resistance between DME control module connector A, pin 13, and oxygen sensor ahead of catalytic converter, bank 2, pin 1 Measure resistance between DME control module connector A, pin 14, and oxygen sensor ahead of catalytic converter, bank 2, pin 2 Measure resistance between DME control module connector A, pin 15, and oxygen sensor ahead of catalytic converter, bank 2, pin 6	< 2 Ω Go to step 3	Eliminate the cause of the fault, restore correct line connection and allocate the correct wiring harness to the correct oxygen sensor. → End
3	Check whether additional faults have been recorded		Work through faults in accordance with instructions → End