New oxygen sensor????

[Dave H]

Car was at Renault for a suspension problem but they say they found a problem with the O2 sensor and changed it!

Never noticed anything wrong....what would a faulty one do?

 

[Track'd]

Just had mine changed yesterday. Wouldn't really rev over 3/4k, exhaust sounded terrible, felt lumpy, nearly stalls at junctions etc..

Hasn't felt better since gettin it changed and now doing 38mpg, not 34mpg on same drive to work

 

[mattjk]

pisses me off to no end when garages just change things without your consent, id ALWAYS ask for the old part

Im sure you could take it back and get them to put the old one back in and ask for the money back

 

[Dave H]

It was done under warranty.....just a couple of months left.

 

[JAY172]

they might have found a fault with the downstream sensor which wouldnt affect running at all.

 

[Martin_172]

downstream wont cause any running issues but will still throw up the emmisions light after time i think?

upstream will cause issues, lumpy idle, flat spots when cold etc

 

[jayc73]

Hi
which is the downstream sensor as you have 2 sensors is it the one near the engine or near the catalyst????

 

[bmh.01]

The one downstream of the cat.

 

[DMS]

If it was changed under warranty I wouldn't worry about it. Something for nothing and all that...

 

[armandjones82]

Try to really check the previous oxygen sensor. It maybe needed a clean up. Or if you already have changed it, try to see if the oxygen sensor that you have is compatible. All throughout, try to observe and see things.