Hello Everyone,
I have a 1999 Jeep Wrangler that couldn't pass the California smog test this year. When it failed the first time a month ago for high NOx, my mechanic told me the catalytic converter was worn out and needed to be replaced. So I had a new cat installed. My Jeep has Federal emissions but because I live in California, I bought a California-approved cat. I got the Jeep retested but failed again. Took it to a shop that was recommended by a couple of people, the new shop found the exhaust manifold was cracked so we replaced it. They also replaced the O2 sensors. The shop retested but NOx was still too high. They installed new fuel injectors (?) and retested but since it failed again, they put back my old ones because it didn't look like the new ones made a difference. The technician also reset the adaptations by disconnecting the battery. After all this, smog test failed again. I was able to get a one-time waiver from the State BAR Referee because I had already spent over the monetary threshold in emissions-related repairs but this means I have two years to figure out what's wrong with my Jeep because it MUST pass the next smog test or else I would need to retire the jeep or sell it to someone out of state where smog tests are not required to register the vehicle. I'm out of my wits end and no one could seem to figure out what else could be wrong with my Jeep. It's running great, no black smoke or anything like that. My Jeep doesn't have an EGR system in it so that couldn't be the problem either. Please help. Thank you very much in advance.
I have a 1999 Jeep Wrangler that couldn't pass the California smog test this year. When it failed the first time a month ago for high NOx, my mechanic told me the catalytic converter was worn out and needed to be replaced. So I had a new cat installed. My Jeep has Federal emissions but because I live in California, I bought a California-approved cat. I got the Jeep retested but failed again. Took it to a shop that was recommended by a couple of people, the new shop found the exhaust manifold was cracked so we replaced it. They also replaced the O2 sensors. The shop retested but NOx was still too high. They installed new fuel injectors (?) and retested but since it failed again, they put back my old ones because it didn't look like the new ones made a difference. The technician also reset the adaptations by disconnecting the battery. After all this, smog test failed again. I was able to get a one-time waiver from the State BAR Referee because I had already spent over the monetary threshold in emissions-related repairs but this means I have two years to figure out what's wrong with my Jeep because it MUST pass the next smog test or else I would need to retire the jeep or sell it to someone out of state where smog tests are not required to register the vehicle. I'm out of my wits end and no one could seem to figure out what else could be wrong with my Jeep. It's running great, no black smoke or anything like that. My Jeep doesn't have an EGR system in it so that couldn't be the problem either. Please help. Thank you very much in advance.