Hi, I have a '99 Discovery Series I with 162K miles on it. A couple of weeks ago, my check engine light came on: code was P0500. I replaced the VSS and the light went off. Now it came on again with the codes: P0500, P0130, and P0138. P0130 and P0138 are for O2 sensors (Bank 1 and another one). So I've decided to replace all four. But what are the correct sensors to buy? I looked here, and found that there are a number of different part numbers for each sensor:

http://www.discountconverter.com/o2_...CylSelected=V8

Also, I found them cheaper on another website. Anyone recommend the lowest priced site?

Thank you VERY much!

 

At your mileage, you need all 4 and those cheap ones aren't really the way to go.
Check Atlantic British or Rover Connection.

 

OK. Thanks. But on the site I listed above, they show two different O2 sensors for each...for example:

DISCOVERY V8 Post-cat Left Part Number 250-24498 23" long, $68.15

DISCOVERY V8 Post-cat Left Part Number 250-24804 20.5" long, $124.70

So I guess I should just get under the truck and measure them?

 

Before you go and replace all your O2's when was the last time the engine was tuned up?
90% of O2 fault codes are due to bad plugs and wires.

 

Actually got charged $400 for new wires a few months ago by a mechanic. I took the truck in b/c it (and STILL does this) hesitates off the line. It feels just like it would if the transmission were slipping. Then again at 40 mph it couldn't decide which gear to go into. After the new plug wires, which the mechanic said was the problem (he'd "seen this before"), the truck still hesitates off the line but now waits until 45 mph until it can't decide which gear to go into (I had the trans replaced 2 years ago).