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International Automotive Technicians Network

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

MY 2019 + Honda EGR monitor strategy
05/27/2020 in the Emissions Forum
Never saw EGR monitor ready on newest Honda v6 engines. Three or four cars came to me with complain not passing TLC I/M test. In NYC taxi require obdII monitors be checked on cars with more than 500 mi. I made EVAP monitor to pass and let them go, one inc...
CA OIS update
05/21/2020 in the Emissions Forum
We have been forced to update to a new software version this morning that wastes two entire pieces of paper to tell you and the consumer that there are no open recalls on the vehicle being smog-checked, pass or fail. It was bad enough that the older softw...
Possible driveabilty issues with winter blend fuel
04/26/2020 in the Emissions Forum
As a result of the coronavirus, fuel consumption has been significantly reduced in the US. The US fuel distribution system is dependent on high throughput volume to change from high vapor pressure winter fuels to low vapor pressure fuels used in the summe...
1990's Honda EGR strategy
04/10/2020 in the Emissions Forum
[Driveability: 95 Honda Civic VX 1.5L] Hello all, I have an 1995 Honda Civic VX (federal emissions) that is failing the EGR functional test because there is no vacuum signal to the EGR valve. We have checked everything I can think of to test. I know this...
To clear, or not to clear
03/20/2020 in the Emissions Forum
Years ago one of the update classes for my smog licenses highlighted the idea of not clearing the codes to make the c.e.l. go away. Instead it showed that we can make the light go off organically by running drive cycles, or operating the engine/vehicle un...

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