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Discussion Starter · #1 ·
Hi I have a 1999 s80 T6 . The error is emission system service required. The codes are 2 A1 A , 2 B1 A , 290 A , 280 A , 9400. Help please
 

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Discussion Starter · #3 ·
I donot know.
2 A1 A say (oxygen sewsor 2 insufficient dynamics)
2 B1 A say (sewsor (bank 2 sensor 2) insufficient dynamics)
 

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The O2 sensors are most likely bad.
Bank 2 is the left side of the engine.

The dealer has a updated harness to help them from going bad to soon.
 
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