Hello, Im newhere ,hey every oneand I need some help. I have 185000 on my 1999 s70. I think I need to replace the cop. last time I change the spark plugs which is ever 25000 milesthey had **** on them to rich gas mix I tk. Also I have lost about 2 mpg use to get 25 now its between 21 to 23. Its not missing but it does not start like it use to. So
question 1: if I need new COP where is the best place and price I can get them and how long should they last.
question 2: Or could this be O2 sensors already replace them once about 50,000 miles ago. Light is not on but It came on after they did an upgrade and I had to take it back they reset the light and it has not come back on? They said that the back 02 sensor is not working like it should but the(back one)1st one lasted over 130.000 this one only has 50,000. both the front and back where replaced around 130000 miles. If 'the 02's need replacing where is a good place to get them the dealer wants a arm and leg for them.

Thanks Brett

 

OK, help me out here just exactly what is the COP?

As far as O2 sensors go.....

http://www.fcpgroton.com/category-exec/category_id/170/sub_top_menu_item/by_make-by_model-by_year/by_make/78/by_model/1161/by_year/49

 

C.O.P stand for Coil on plugs the new spark plug wires? If they miss fired or not
working wright they could cause the 02 sensors to miss up by not burning the
fuel mixture properly. I have never had a problem with the Volvo but my
Thunderbird has. You will know when they are not working right. Your car will
go into limp mode and check engine light should come on.