civicsaremean

how do u check the code for check engine light? i have cel due to primary o2 sensor? how do u fix this?

MatterMatt

I'm pretty sure there is a thread on how do check codes without a scan tool. If you have a primary O2 sensor code you replace the primary 02 sensor. Yeah, yeah, check for power, ground, etc. too, but its more likely to be the sensor itself.

civicsaremean

where is the primary o2 sensor at?