Join the community and post your question. Use our Ask-A-Tech for free now! ASE experts standing by.

Forum > Failed Smog Test > Question

2002 Ford Escort SE Failed Smog for High NO

I took my Ford Escort for a smog check and it failed because the NO ppm was three times the allowed limit. What can I do to lower NO on my car?

Answer:

We recommend visiting the page below to learn more about what could have caused your 2002 Ford Escort to produce and fail because of high NO. Typically high NOx is cause due to defective a dirty or defective EGR valve. For high NO failures where the EGR system is inspected and no faults found it is recommend to check for vacuum leaks and problems which could cause a lean air/fuel ratio. What causes high NOx? posted by SmogTips Support

Related questions and answers you might find useful:

How Do I Get a Smog Check Waiver? by Margaret

Do I Need a Smog Check This Year? by Joy

View SmogTips.com in: Desktop / Mobile