fuel pressure test
Can anyone help me on how to do a fuel pressure test? I'm having trouble finding a gauge that fill fit on the valve at the fuel rail. I want to know this because I keep getting a P0420 code for catalytic effeciency below threshold. I've replaced my cat and everything and it still occurs. I read in a Haynes book that a rich fuel mixture may trigger the code. Any help would be greatly appreciated.
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