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Automotive Emissions Forum

Professional automotive forum for discussion of automotive emissions, on-board diagnostics (OBD2), and emissions testing programs around the world. The discussions often cover both the non-technical aspects (such as enforcement, automotive politics, and legal), as well as the technical aspects of emissions and emissions-related repairs, including the differences between vehicle certification and the various inspection and maintenance programs around the world. This forum is for experienced automotive repair professionals only, membership required.

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Recent Automotive Discussions in the Automotive Emissions Forum

Judging Catalytic Converter Efficiency
10/14/2026 in the Emissions Forum
So I\'m new to california emissions sniffer testing and I could use some teaching. Hopefully will get a lesson on diagnosing cats. I have a 93 ford explorer with a 4.0 that i previously posted about for egr. I did not find anything wrong or clogged i...
1993 Ford Explorer 4.0 EGR Testing And Ports
10/12/2026 in the Emissions Forum
Hey guys, I got a car here that failed california emissions for high nox. Its a 1993 ford explorer 4.0 and 138k miles. I need help making sure this egr system is working as it should. I made sure that under load, the egr is getting vacuum. I pulled...

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