Has anyone used one and passed emissions testing? I think the OEM one on my 91 Civic has finally bit the dust and is why my car is failing emissions and has slightly reduced mileage lately. Autozone has the A/ M ones for $23.
This comes after quite a lot of diagnosis effort. Today I think I had the proverbial breakthrough: The purge cut-off solenoid valve (in the evaporative emissions control system) was stuck in atmosphere vent mode, whereas once the rad fan has come on once, it is supposed to send a vacuum signal to the charcoal canister's diaphragm. I found the electric signal to the solenoid valve was constant at battery voltage, which tells me the ECM is not varying its signal to the valve, which implicates AFAIC the danged TW sensor. With J Beam's observations on the TW sensor of a few months ago, and slightly reduced mileage of late, and some other things (like the importance of doing emissions testing in warmer weather on these old Hondas and how much control the TW sensor has in open loop operation) it all seems to add up.