Just changed out the timing belt, water pump, and front crank seal on our 01 S80 T6, and am now getting 2 codes coming up, P0030 and P0050. Someone has told me it may NOT be an O2 sensor problem, but could possibly be a vacuum hose problem. SOOO....before I go buying 02 sensors, any input you may have as to how to narrow down the cause would be greatly appreciated.

If it IS the 02 sensors, can you tell me exactly where they are located and how to get to them.....I have been under the car a lot today---and it looks pretty full under there (LOL!).

As always............THANKS for your help!!!

 

It more than likely is the sensors, but those are just for the pre-heating element, the sensors probably are ok, just not at start up. You will need to replace the sensors though to fix it.


Heated oxygen sensors (HO2S), replacingSpecial tools:
999 5543

Note! As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information in the illustrations is always correct.
Replacing front heated oxygen sensors (HO2S)Removing front heated oxygen sensors (HO2S)
Remove the splashguard under the engine.
Disconnect the connectors for the heated oxygen sensors (HO2S).

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Installing front heated oxygen sensors (HO2S)

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Finishing

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Clamp the servo hose to the torque rod using a tie strap.
Test drive the engine.
Check for leakage.

Replacing rear heated oxygen sensors (HO2S)Removing rear heated oxygen sensors (HO2S)
Remove the splashguard under the engine.
Disconnect the connectors for the heated oxygen sensors (HO2S).
Remove the screws for the front SIPS member.
Slacken off the clamps for the heat deflector for the heated oxygen sensors (HO2S).
Pull back the heat deflector. Install tool 999 5543 .
Remove the heated oxygen sensors (HO2S).

Installing rear heated oxygen sensors (HO2S)

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Test drive the engine.
Check for leakage.


Erase Diagnostic Trouble Codes (DTCs).


Reset trim.

 

Hmmmm.....ok. Help me understand a bit here, though.....IF the sensors ARE ok, is there nothing else I can do but replace them-just to get the darned check engine light out? (or did I misunderstand what you were trying to tell me...?)

Thanks for your patience!

 

Well, darn..........the link that was posted above will not download. Anyone have another one? Thanks!