did they use an OEM sensor? When I put the headers on my car at 17k miles BOTH my AFR sensors stripped out. I ordered 2 from Nissan, took 3 days to get, guess what, they ordered the wrong sensors...they ordered the secondary cat 02s. Also, if they used an aftermarket they may not be aware the primaries in the headers are actual wideband AFR sensors not conventional o2s. I have a pocket obd2 scanner I keep in the car, or but kiwi or something, always good to have anyway, then you can pull the code.
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