Refitting an exhaust after the owner changed plans.

Refitting an exhaust after the owner changed plans.

A customer supplied a downpipe for us to fit. The post-cat oxygen sensor was bent and had a heater-circuit fault. We offered a replacement, but the owner chose to source one separately. Tuning did not remove the sensor fault.

The owner later asked us to refit the catalyst because the exhaust was too loud on long journeys. The replacement sensor supplied on that visit was the wrong part. On this ECU a working post-cat sensor was still required, and the warning light remained on without it.

Fitting customer-supplied parts, reversing a modification and replacing faulty sensors each take workshop time. Agree the labour and parts costs before work begins, including any further visit if the supplied part is unsuitable. Think about normal road use and exhaust noise before choosing a track-oriented setup.