This is my first post here and my first Alfa, so you may have to bear with me somewhat...
A few months ago my Golf (MK4 V5) decided to develop a multitude of electrical problems just after having finally worked out all the coolant leak issues, so I decided that a reliable car was needed to ensure that I could get to work on time without changing the battery every morning. So I bought a Brera V6
Because every decision in my life is a sensible one.
Fast forward a couple of thousand miles and I start noticing a misfire when cruising around 60 mph (~2200 rpm) whenever I put my foot down. This is accompanied by some occasional missing at idle and a P1172 code (something about idle air mixture control) and everybody's favourite "Check Engine" light.
The odd thing about this though, is that it only seems to occur after heavy rain or having the car washed! If there's a few days of sunshine it goes away...
Or it did, until reaching the natural conclusion that it was likely water getting into the post-cat Lambda connector on the bulkhead. Application of WD-40 to the connector seemed to put a stop to the misfire temporarily, until it returned in force with a different fault code
Now I no longer get the occasional P1172, but I do get a P2097 "Post Catalyst Fuel Trim System Too Rich Bank 1" error, pretty much without fail every time I drive her. Research suggests it is most likely that the problem is as stated and I need to change one of the rear lambda sensors. This leaves me with a few questions:
- Has anybody else experienced this or know if I am actually on the right track?
- How does one best go about changing the rear lambda? Is there a guide or workshop manual for these cars?
- I begrudge paying £200 for a Bosch sensor, especially when I also have to pay road tax this month! Is there any reason not to buy from the likes of Cambiare? I am considering this equivalent part.
Thanks in advance for any help - I'll be back with more questions I'm sure!