I changed all 4 O2 sensors this weekend and the service engine soon light came on.

I got my codes scanned and most are from O2 sensors but there was also another one here they are:

P0155 (O2 sensor)
P0135 (O2 sensor)
P0154 (O2 sensor)
P0134 (O2 sensor)

P1590 Neutral position switch circuit high input?

Any ideas? I'm not sure why the O2 sensors are not being recognized. How long does it take for codes to clear?

 

Where did you get your O2 sensors from?

 

You also may want to pull a David Banner and get like me. Posting your year, model and mileage in your signature is easier then putting it in every post when a problem strikes.

Also, what originally made you to decide to change your o2 sensors? Any problems prior to the swap?

 

Sorry it's an '02 Disco Series II with 109,000 miles and the O2 sensors are from British Atlantic. I decided to swap my O2 sensors because I doubt it has ever been done and my gas mileage was horrid (even worse than normal).

Prior to this I installed magnecor wires. For what it's worth the engine is running a lot better after the O2 sensor swap.

 

Are you sure you didn't install the rear 02's in the front by mistake??
I would recheck your connections, if they are good, I would contact AB with your codes and get new ones.
As for the 1590, this is a rough road/ABS fault code, not what you mentioned, as your 3 Amigos been flashing or are they on???

 

I believe the connectors on the rear and front are different so I don't think I messed them up. If they are interchangeable then yes that could be a problem but I could have sworn the clips are physically different between the front and back though. The connections are good though I triple checked them about 5 times


3 Amigos are on and have been on for a while now. I have a new hub coming Fedex today so I am going to try to tackle them this weekend.

 

Is there a free way to clear codes or do I need to rent a diagnostic scanner?

 

You can get most auto parts stores to clear the engine code but you will not be able to clear the 3 Amigos, special scanner only.

 

Yeah I just wanted to make sure that the codes are still there after I clear them. Thanks I will get them cleared I'm not too worried about the 3 amigos tight now. After I install the hub I will tackle them.