I have been told that I should replace all 4 of my O2 sensors. My Disco II has 110k on it and is showing a check engine light.

Last weekend I looked under the hoodand I could see two sensorsthat look easy to remove and replace. Can anyone tell me where the other two sensors are located?Sorry to ask, but I am out of town on business and my DII is at home so I can't crawl under it to see check if they are visible from below.

Also, I am assuming that I need to order two of the front sensors (MHK100920)and two of the rear sensor (MHK100930)?

Once these are replaced do I need to have the errors reset, or will they go away with replacement of the sensors?

Is replacing these an easy process, or should I have my mechanic replace them?

Thanks for any help!

 

You can replace them, 2 in front of the cats, 2 in back. Crawl under the truck and you'll see them. You can do it your self, a few are tougher to get to supposedly. Haven't had to do mine yet. Everyone recommends you do all 4 at the same time though. As for the codes, someone else may chime in, not sure on that one.

 

Who are you ordering them from, don't pay more about $70 a piece. What were the exact fault codes and yes, they will need to be cleared with a scanner.

 

On those sensors.

Pros and cons of aftermarket. Splicing the the wires to the old connectors. A good splice job, any problems? Aftermarket for about $25 each versus original at $60 to $75. I will do these in the next month or so and was looking for wisdom.

 

You will get exactly what you pay for, splice and loose, aftermarket like Bosch are OK, factory will be the best if you don't want problems down the line.

 

Do the Bosch have connectors or is it a splice job?

 

Connectors.

 

any ideas on where to find best prices, factory or otherwise?