Skip the auto shop - Our mechanics make house calls

Q: My car failed the smog test and two codes came up: P0422 and P0432 Both Catalyst 2 Efficiency Below Threshold Bank 1 and Bank 2.

asked by on

Can the catalytic converters be repaired or do they have to be replaced? How much would it cost? Who can make the repair other than the dealer? I am worried the cost is more than what the car is worth.

My car has 249000 miles.
My car has an automatic transmission.

A: Hello there, thank you for asking about you...

Hello there, thank you for asking about your 2003 Mercedes-Benz ML350.

The catalytic converters have to be replaced. You have 4 options for parts and labor: 1. Have a certified technician from YourMechanic come to your home or office to replace your catalytic converter. This service includes both parts and labor. 2. Buy the parts from Mercedes-Benz. This will include a length of pipe, for the left and the right, that have 2 converters each. Have Mercedes-Benz give you a quote for the whole job. You could also buy Mercedes parts and call around shops to get a quote for installation. 3. Aftermarket replacements are available to buy that are specific to your car and will be less expensive than the parts form Mercedes-Benz. You can call local auto shops to get a quote for installation. 4. Have a muffler shop cut out the old converters and weld in new ones.

If you choose to go to an auto repair shop, find one that specializes in German cars. You can also have a technician from YourMechanic who is specialized in German cars come make the replacement.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Can you give me a quote on replacing a catalytic converter for my vehicle?

Billing question sent to CS for the cost to replace the catalytic converter on a 2004 Hyundai Santa Fe.

Q: car maintenance tips

Hello, thank you for writing in. When it comes to "long-term" storage maintenance is really more about preparation. Storing it in a heated (or even unheated) garage is one of the biggest steps. This will keep it dry, out of...

Q: 2006 Jeep Commander horn problem

Hi there. Check the wiring from the horn button to the horn and see if there is any loose wiring or any burned wires. If all the wiring looks good, then the issue is within the steering column. The horn...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.