What is involved in replacing the O2 sensors? Don't they just thread in?

 

Yes, they are pretty easy in theory to change with the right tools. Getting the old connectors apart after many years is actually the harder part.

 

I had all 4 brand new o2 sensors removed, and they were already black with like smoke residue.I exchanged them and got new sets but i don't want to replaced them to have to same thing happen. the mechanic said something bout some rod or pipe not burning the oil properly.... something to dat sort, anyone has an insight?

 

90% of O2 faults on Rovers is due to the need of a tune up, that means new plugs and wires.
Weak spark will send to much unburnt fuel down stream and foul the O2's and once fouled they will not work correctly and the ECU will read that as non responsive (bad O2)
Just because you do not have mis fire codes does not mean your plugs and wires are still good.

If they put new plugs and wires on when they did the head gaskets then it is a bad MAF I would say.

 

hey spike555, i had new plugs and wires all the works put in when i replaced the engine head, omg that disco runs so smooth compare to when i got it. the mechanics says it not the MAF, i still haven't put the plugs on as yet. when i get these things taken care off, i hope the service engine light goes off

 

hey rover lover, i was looking for an update on your disco. i think i have the same problem.
thanks
carlos

 

hello everyone, first timer. im having a problem with my 2000 discovery,.ever seens my engine light came on, different codes keep poping out.
p1663
p0500
p0115
p0135
p0154
p0134
p1590
help,
thank you