Loud exhaust, a rattle underneath, a catalytic converter code or a stolen converter? We repair exhaust systems with emissions in mind.
The exhaust system carries hot gases from the engine, quiets the engine, and does a big share of the work of keeping your emissions clean. That's why exhaust repairs and smog checks go hand in hand at Walnut Smog & Repair.
A P0420 or P0430 code doesn't automatically mean the converter is bad. Misfires, oil burning, an exhaust leak or a lazy oxygen sensor can all trigger it, and converters usually fail because of an engine problem that was left alone. We check the cause first through our engine diagnostics. When a converter does need replacing, California requires a CARB-approved converter for your specific vehicle, and an aftermarket converter that isn't approved will fail the visual portion of a smog check.
Converter theft has been a real problem across Los Angeles County, especially for hybrids and trucks. If your car suddenly sounds like a race car when you start it, look underneath. We can replace a stolen converter with a compliant one and fix the cut pipes properly.
A leak ahead of the oxygen sensors can confuse the engine computer and cause a check engine light or a smog failure. A leak under the cabin can let carbon monoxide inside, which is dangerous. If you smell exhaust inside the car, have it checked promptly. Many failed smog repairs start right here, see failed smog repair.
Not always. Sensors, misfires and exhaust leaks can cause it. We diagnose first.
No. California requires a CARB-approved converter for your vehicle. A non-compliant converter fails the smog check.
Yes. We install a compliant converter and repair the cut exhaust pipes.
It can be. Leaks can let carbon monoxide into the cabin. If you smell exhaust inside, get it checked soon.
Yes, a leak near an oxygen sensor can throw off readings and set codes.
Smog checks, failed smog repair, check engine diagnostics and complete auto repair on E Walnut St. Honest answers and fair prices.