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Glad you got that sorted. With the next map release we are going to re-enable the diagnostic fault codes for o2 sensor rich/lean. Because those codes occur when you have an exhaust leak. We learned this ourselves after replacing gaskets. Once replaced, those codes never came back on our car. So all this time, we were simply masking an issue. For those OFT who want to see if this applies to them, simply re-enable those o2 sensor diagnostics and see if you trigger those code(s). If you do, definitely replace your header gaskets (there are 3 of them).
Cheers,
shiv
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