2001 s40 slow 02 p0133

anotherheadache · Post by **anotherheadache** » 12 Apr 2011, 14:37

Can any one help with this recuring code? I have replaced the o2 with genuine Volvo o2 and lead adapter. all is working acording to my scan tool. but engine light returns in 15 miles or less.

Post by **billofdurham** » 12 Apr 2011, 15:16

Welcome to Matthew's Volvo Site.

This code can be set by oxidation, oil or grease in the connectors. Other things to check for: exhaust system leaks, especially between the front and rear oxygen sensors and between the exhaust manifold and the front oxygen sensor and intake air leaks, no matter how small, can set this code.

Bill.

anotherheadache · Post by **anotherheadache** » 13 Apr 2011, 08:29

thanks Bill I checked for leaks,corrosion Ect. nothing changes the out come so far,I starting to think harness? checking ohms next between sensor and ecu.

Post by **jblackburn** » 13 Apr 2011, 08:31

Check your vacuum hoses. At this age, they're getting to the point where they've begun to crack and get brittle. Elbows are usually the first to go.

A can of carburetor cleaner will help you find any leaks if you notice a surge in RPM while idling.

volvodoc · Post by **volvodoc** » 19 Apr 2011, 09:03

you need to reck for air leaks i have seen many exhaust manifold gaskets cracked causing this code you wont always here the leak but it doesnt take much