standing-behind-our-work:-what-it-looks-like-in-practice

Standing Behind Our Work: What It Looks Like in Practice

When Logan brought his 2007 Pontiac G6 back to Sherwood Auto Repair, the check engine light had returned with the same P0420 catalyst efficiency code. A vehicle returning with the same concern doesn't always mean the original repair has failed, so our technician began by performing additional testing and analysis rather than assuming the catalytic converter needed to be replaced again.

The vehicle was road tested while monitoring live emissions data. The rear oxygen sensor was responding normally, fuel trims were within specification, the mass air flow sensor readings were correct, and no exhaust leaks were found. We also reviewed applicable Technical Service Bulletins but found none related to the concern. Based on those findings, the next step was to update the Powertrain Control Module (PCM) to the latest factory calibration. Logan approved the update, and the vehicle was retested.

Although the PCM update was completed successfully, the catalyst monitor still would not complete. That additional testing changed the direction of our analysis. With the software update eliminated as the cause, the catalytic converter itself became the remaining source of the recurring concern.

Because the catalytic converter had been installed by Sherwood Auto Repair, the replacement was covered by our 60-month, 75,000-mile labor warranty. We replaced the converter under warranty using an OEM-grade replacement. After installation, the vehicle was driven until the catalyst monitor completed successfully. No fault codes returned, the exhaust system was checked for leaks, and the repair was verified before the vehicle was returned to Logan.

A warranty doesn't change our process. Every vehicle. Every time. We perform testing and analysis, follow the evidence, and verify the repair before handing the keys back.