I have a 1997 Honda Passport (3.2L, V6 engine, 141,989 miles), and it has failed smog due to (very) high emissions, specifically " HC" and " NO" emissions. I had a diagnostic run on it, which identified Catalytic converter and O2 sensor problems, on the right side. I replaced the entire right side emission system (pipe, cat converter, O2 sensors), but the emissions reading came in even higher after that! I have replaced the air filter and added gas & oil treatments, apparently with no success. My " check engine" light is still lit as well (codes related to Cat, O2 sensor problems). Can anyone help!
Check the EGR make sure its getting vacuum, also all passages clean of carbons.
August, 23, 2007 AT 3:39 AM
We'll take this one @ a time
O2 sensor/s is it OEM parts?
Check the EGR make sure its getting vacuum, also all passages clean of carbons[/quote: 9d8ad93128]
If the EGR system is leaking or inoperative, it can cause driveability problems, including detonation (knocking or pinging when accelerating or under load), a rough idle, stalling, hard starting, elevated NOx emissions and even elevated hydrocarbon (HC) emissions in the exhaust.