I just bought a chrome header to replace my crusty stock a4 header. Turns out that this header I bought has only one hole for an O2 sensor, and its located on one of the top pipes. Would it be alright to relocate the O2 sensor from where it is now (below the car, on the downpipe)? Besides the O2 sensor only reading from one cylinder, are there any other disadvantages? Performance problems? Emissions problems? Will my check engine light come on?
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Header O2 Sensor Location
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Other than only getting readings from one cylinder, you shouldn't have any problems. Hopefully you can move the location without having to cut any wires. I've been told that changing impedance by cutting and reconnecting the wires can change the signal from the o2 sensor, but I personally have never had to mess with it, so .
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