O2 Sensors Bank 2 sensor 1 and sensor 2

[kneehurts]

2003 Discovery tripping 2 codes, 1 for O2 Sensor Bank 1, the other for O2 Sensor Bank 2. I am going to order and replace the O2 sensors since I have to take the truck through emissions. I was just wondering if the codes may be indicative of another problem?
Autozone erased the (2) codes and the Service Engine Soon light came back on about 10 miles later.
The truck has 42K miles.
Thanks, Chris

 

[Jleebee1975]

I just went through the same problem with my 2000 Discovery. After replacing all four O2 sensors the light was still coming on. The next place to look is the mass air flow sensor it may be dirty causing the ECU to dump fuel resulting with the O2 sensors sending a rich code. Unfortunately my problem ended up being the ECU itself. The dealer had my vehicle for about 2 weeks and $3100 dollars later it was fixed. Best of luck.

 

[joey]

I would start by cleaning the MAF...