Well did my first long run with my new disco and of course CEL came on I put my scanner on it and pulled these codes.

P1590- ABS rough road signal malfunction

P0135- O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P0155- O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

P0171- Multiplication injector adaptive fuelling lean limit exceeded LH bank

P1171- Oxygen Sensor System Too Lean Fault Banks A & B

P0139- Oxygen Sensor Slow Response *Codes* A D

im taking it that i need to replace my o2 sensors but i was wondering if I should just do all 4.

 

I think you are right on the money with getting new O2's. Before you go spend the money it's worth it to have a look at the 2 front O2 plugs. They can get oil inside them from a leaking valve cover and cause all sorts of problems.

If you decide to get new sensors then I would go ahead and replace all 4 sensors from bosch. If you can't afford all 4 bosch then just get the front 2 bosch right now and the rear 2 down the line, but what ever you do I would stay away from aftermarket sensors.

 

If the plugs are dirty what do you recommend I use to clean them? Just some electrical cleaner? If the cleaning doesn't work I'll do 2 now 2 later

 

Yeah, some kind of sensor spray like MAF cleaner or electrical cleaner.

 

By the way woukd bad o2 sensors cause a rough idle?

 

Yes the O2 sensors will cause a rough idle, I am going/went through the same issues. Only I had 15 codes!! If you haven't already I would recommend upgrading to Magnecor 8mm plug wires:

As instructed to me by DiscoMike. Good luck!!

 

Ok yeah my wires say leoni on them