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Old 09-01-2017, 07:32 PM   #15 (permalink)
redpoint5
Human Environmentalist
 
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Join Date: Aug 2010
Location: Oregon
Posts: 12,390

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 26.68 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)
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I usually just knock out the honeycomb and drive on with the CEL. One time I bought a no-name cat for $120 and it didn't resolve the P0420 CEL.

I'd be more inclined to spoof the downstream O2 sensor via thread extension or some other method than wasting time and money trying to legitimately pass stupid inspections. That said, I wouldn't run a car that is smoking or otherwise running poorly.
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