Q: I have a 1998 Caddy DeVille, has original muffler and catalytic converter. had to be tweaked to pass CA smog, replace both?

asked by on

I own a 1998 Caddy Deville, it still has original muffler and catalytic converter. It had to be "tweaked" to pass CA Smog last year. Should I replace muffler and converter? Thanks, Pete

My car has 214000 miles.
My car has an automatic transmission.

Hey Pete, thanks for writing in. The replacements have more to do with what is actually wrong with the vehicle. If they have been modified illegally, then the answer is an automatic yes. Not only does it cause issues with the legalities behind California exhaust standards, but the changes may cause issues with the way the vehicle operates. The catalytic converter does most of the work when it comes to emission standards, and it will need to be focused on first. The muffler does more for sound regulation, but there are laws regarding them as well. Again, start by replacing the catalytic converter first. Replace the muffler if it is damaged, rusted out, or illegal. If you need help making the repairs and getting the car to pass SMOG testing, contact our service department to schedule an appointment.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have a 1998 Caddy DeVille, has original muffler and catalytic converter. had to be tweaked to pass CA smog, replace both?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Catalytic Converter 2004 Nissan Xterra

Hello - there are 4 catalytic converters for your vehicle with the V6 engine. There is one that is part of each exhaust manifold (that's 2), and one for each exhaust pipe just below the exhaust manifold (2 more). Space...

Q: My car have a RAF problem

Hello, thanks for contacting YourMechanic. When a vehicle is started up and about a liter of water emerges from the tail pipe, there is a problem. One problem is that you could have too much condensation in your pipes. The...

Q: whats the cost to replace a bumper, hood, header panel, left and fight fender and core support

A body shop would need to be consulted for doing body work and replacing large components and panels.

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...