× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: Failed NoX I/M 240
Posted to Emissions Forum on 10/28/2013

Your repair reminded me of a similar experience that I had had a few years back on a late-90s Toyota truck with no EGR, no codes, and a significant ASM NOx problem. I was able to determine that the HO2S was too lazy to keep the catalyst happy, but not lazy enough to code.

A fresh HO2S made a HUGE difference in the NOx emissions, enough to surprise me __and__ the bureau representative who called me up after remotely viewing the passing report to question .. er .. congratulate me on the success of the repair. That was one of the few completed CAP repairs in which I've participated that came in under the spending limit with a solid pass.


Michael Barry
Quick Stop Smog & More
Sacramento, California, USA