thanks for the views

50 Nm or 37 lbs/ft:cheers:

 

50 Nm or 37 lbs/ft:cheers:

I actually had this number in my head and was about to hook you up. This # is correct if you used an O2 sensor socket, but if the torque wrench was "off to the side" because you used a crow's foot attachment the # is different. Which way did you do it?

A decent torque wrench should explain how to compensate for a crows foot in its manual, but the formula/graphic can also be found online.

 

data point: 55K miles. Bank one fault code. Replaced with Bosch 13477.

In the Pic. bank 2, bank 1 respectively.

:wroom:

 

I got OC code for Pre-oxygen senor which Is bank 2, passenger side in Ireland (Driver side US) - correct me if I'm wrong.

I got the code a number of times and reset it but it came back very shortly afterwards with Check Engine Light on dash. The last time I didn't bother resetting and ordered the part, it should be in tomorrow. However, I went for a spirited drive last night with a friend and we stopped someone for a few minutes, restarted the car and no check engine light. Still none today - so question is would you bother replacing it or not?

I did the MAF test with light on and got 137 so no issues with performance.

 

Hiya.

If you are in reality seeing a lean or rich condition then a tired pre cat o2 sensor may not be picking it up, and allowing you your 137 L/Hr...

In my opinion change both your pre cat 02 sensors every 60K miles or so, to help keep your M5 running at its max potential and safely.

I get them (Bosch 13477) for about £72 each (inc Vat and delivery) in the UK.

Cheers

Kumaran