Quick fix for codes (Emissions)
My emissions tests are nearly overdue. Unfortionatly I have a check engine light lit. I got the codes scanned and erased a few weeks ago, and the guy said that I had a missfire. I replaced the spark plugs and was good for a few days. Now the lights on again, so I went to auto zone and got scanned again, getting the codes PO138- O2 sensor and P0325 - Malfunction in the electrical circuit for knock sensor 1, and also got the missfire code again. Has anyone had problems with these codes? If I buy one of those code readers and erase it myself will I be abe to pass emissions, or can they actually see if your computer has been cleared? My plates are about to be revoked, and I realy dont have the money to go replacing things without knowing for sure. I plan on replacing the O2 sensor sometime this month but the knock sensor code is making me a little nervous. Any insight into this will be helpfull.