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Q: o2 sensor engine code on 2001 Volvo V40

Check engine light keeps coming on indicating an o2 sensor CKT Slow response (P0133) (Bank 1 Sensor 1) I have had the sensor replaced with an off brand sensor once, a Bosch sensor once and the oem sensor just yesterday. The oem sensor coded the same day. There must be another issue causing these sensor failures. Any ideas or better yet, experience with this problem.
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Look at this article for an Oxygen Sensor malfunction. it applies to your problem as well
Always use the exact part number as a replacement. Avoid after market parts for Emissions parts,because they are made to very exacting specs that must match the software. Always check for a parts update and if there is a software update that goes along with the new part, which is often done with 02 sensors.
You need to really inspect for why the system is not responding. What is the Long Term Fuel Trim? Maybe the car is running too lean? This may set an Oxygen Sensor code. See if there is an air leak. Was the original code P0130 or was there another code along with it, say P0171, which is a lean code?

The Fuel Trim is a very critical issue. Sometimes O2 senors set codes because they are telling the truth!

Thanks dandd for the info and pointing me in the right direction . The Volvo only shop (Mark's Volvo Repair in Chatsworth, Ca.) was able to find a vacume leak around the dip stick asesembly. So far, the check engine light has not come back on
i had this same trouble... replaced the first sensor with bosch sensor, same code, got the OEM volvo sensor, same code, ended up being the second O2 sensor was bad so i ended up replacing both with OEM sensors.
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