I'm pretty sure this thing is trolling me now
Remember how I said there were no error codes or warning lights?
The bank 1 primary O2 sensor failed on the way to the MoT
So, today was swapping both sensors. You can see the bank 1 sensor here:
In fact no, you can't because the damn SAI valves in the way. Well, they aren't working anyway because the vacuum hoses are all perished, and you can be very sure that if I have to take them off for any reason they aren't going back on!
With the valve removed, you can now see the sensor
Bank 2 sensor - this was still working, but at 170k its pointless changing just one of them, and that may result in the two banks running unbalanced anyway which we don't want.
The amount of stuff which needs to be removed to get to the sensors:
Still, thats better than the D3 where you have to remove the inlet manifold
Bank 1 sensor removed
New one fitted, then the same on the other side
Capped off the SAI solenoid valve. The vacuum supply hose will be removed later.
One of the manifold link arms was broken so I replaced that while I was in there
And since I had to take the upper brace out to get the wiring harness out of the way (for the bank 2 sensor) I put a brake block on it when it went back in
It does run more smoothly with the O2 sensors replaced so they were clearly past their best even before the bank 1 sensor died.
This job took 5 hours, 3 of which was exorcising the SAI valves. That puts the total at 147 hours. Sensors are about £60 each.