Check engine light with a P0420 code? Rotten egg smell? Reduced power? We diagnose and repair catalytic converter issues on all makes and models.
Call (818) 500-1939The catalytic converter is a critical emissions component that converts harmful exhaust gases into less harmful emissions. In California, a functioning catalytic converter isn't just important for the environment — it's required by law. A failed converter means a failed smog check, a check engine light, and potentially reduced engine performance.
At A Plus Auto Shop, we don't just replace catalytic converters blindly when a P0420 code appears. We first diagnose whether the converter itself has failed or if an upstream problem (like a bad oxygen sensor, exhaust leak, or engine misfire) is causing the code. This approach saves you from an unnecessary and expensive replacement.
Comprehensive catalytic converter repair services for all makes and models at A Plus Auto Shop.
A P0420 or P0430 code doesn't always mean the converter is bad. We test upstream and downstream oxygen sensor readings, check for exhaust leaks, and evaluate engine performance to determine whether the converter has truly failed or if another issue is triggering the code.
California requires CARB-compliant catalytic converters that meet the state's strict emissions standards. We install California-legal converters that are properly matched to your vehicle and will pass smog testing.
Catalytic converter theft is a growing problem, especially for trucks and SUVs with high ground clearance. If your converter has been stolen, we install a CARB-compliant replacement and can discuss protective shields to deter future theft.
Faulty oxygen sensors can trigger converter-related codes and can actually damage the converter over time by causing improper fuel mixture. We test and replace O2 sensors when they're the root cause of emissions codes.
An exhaust leak before the catalytic converter can introduce extra oxygen, fooling the sensors into thinking the converter is failing. We inspect for exhaust leaks and repair them before condemning the converter.
If your vehicle failed a smog check due to catalytic converter issues, we diagnose and repair the problem so you can pass. We handle all emissions-related repairs including converters, sensors, EGR valves, and EVAP system components.
Answers to common questions about catalytic converter repair at A Plus Auto Shop.
P0420 means 'Catalyst System Efficiency Below Threshold.' It indicates the catalytic converter isn't converting exhaust gases as efficiently as it should. However, the code can also be triggered by a bad oxygen sensor, exhaust leak, or engine misfire — not just a failed converter.
Catalytic converter replacement can be expensive, especially in California where CARB-compliant converters are required. Cost varies significantly by vehicle. We always diagnose first to confirm the converter is the actual problem. Call (818) 500-1939 for a quote.
A partially clogged converter may cause reduced power and poor fuel economy but is usually safe to drive short distances. A severely clogged converter can cause the engine to stall or overheat. If you notice a rotten egg smell or significant power loss, have it checked soon.
If your catalytic converter was stolen, you'll know immediately — the car will be extremely loud when started, like it has no muffler. You may also see the exhaust pipe cut and hanging underneath the vehicle. Contact us for a replacement.
A Plus Auto Shop is your full-service auto repair destination in Sun Valley, CA.
Walk-ins are always welcome at A Plus Auto Shop. No appointment needed — just stop by or give us a call.