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Failing emissions, can someone help me figure out how to pass?


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I’ve failed emissions in my 93 Legacy for high carbon monoxide. It’s very close to passing, just need to get the emissions down by about 1ppm and I’ll be good.

 

The spark plugs and wires have been changed, new O2 sensor and cam sensor, fresh oil change, and I’ve reset the ECU. It recently threw a code for the MAF but someone told me that shouldn’t be affecting the CO emissions anyway. I’d rather not replace something unless I know it’ll help.

 

So does anyone have any other ideas or suggestions on passing the emissions? I don’t want to pour E85 in these old fuel lines but I’m trying anything if it’ll work.

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