1995 Mazda 626 High NOx Fail

MAZDA 626
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HOTMAMA0604
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  • 1 POST
i have a 95 mazda 626 appx160000 miles. i failed echeck due to a nox level to high. my husband put seafoam in the gas tank twice and the readings got better but just not good enough, if anyone has any answers please help me. also all of my other readings are perfect. the nox level is about 1604. and it should be in the 1200.help
Apr 4, 2006 at 7:54 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
You have a tired engine. Take it to a good mechanic and see what the O2 reading are with a scanner. It sounds like your engine is running rich. Seafoam is a very bad idea as it will ruin the injector screens. Good Luck
Apr 4, 2006 at 8:15 AM

Suggested Repair

Have a mechanic scan O2 sensor readings. High NOx with otherwise normal readings can indicate a worn engine running rich. Do not add Seafoam to the fuel tank, as it can damage injector screens.

Conversation Summary

The owner of a 1995 Mazda 626 with about 160,000 miles failed an emissions check because NOx was about 1604 versus a limit near 1200. Other readings were fine. Seafoam in the tank improved results but not enough. The expert said the engine is likely worn and running rich, recommended checking O2 readings with a scanner, and warned that Seafoam can ruin injector screens.

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