Good morning all.

I have a 2001 volvo s60 with 2.4L turbo engine. Could any of you please recommend some O2 sensors for my car? I assume my car only has two sensors. one upstream and the other one downstream. And I was told the original O2 sensors were Bosch.

Therefore I was looking for some Bosch O2 sensors and it seems everyone fit by car. However, I saw some with 4 pins and others with 5 pins. I also saw some with round heads and others with square heads.

Is there a certain type of O2 sensor that I should be looking for? If so could you please provide the catalog number.

Thank you!