I got the El light triggered on my 95 850 turbo y'day. As to what I understand is that this is the pre-cat O2 sensor going bad (maybe 2 days after a shot of SEA FOAM). I have few questions regarding this because this car failed the Ontario e-test last week and i got a temperory permit to drive it for 10 days only (2 more left).

1- Is the sensor same for turbo and non-torbo?

2- Is it possible to clean it - i mean will it work or help?

3- Can this really make the car fail in NO component of the emossions?

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If the O2 is bad you will need to replace it.It may have to much or to little gas going into the motor.

 

Still failed the e-test with more bad results. Its failing only on NOx component of the test.
Does that mean that catalytic converter is shot or the tune-up, Oxygen sensor, turbo or anything like that plays a role in this?

 

Still of the O2 is bad it can be messing it all up.