Q: My engine sensor code said my catalytic convertor went out. Do I have replace all three or only one?

asked by on

My engine sensor has been on for a little while. I got it checked and it said The catalytic convertor went. I looked up my cars exhaust system and it says there's three converters inside it. I'm curious as to if I have to change all three or just one. Do they all go once one goes or ??

My car has 110000 miles.
My car has an automatic transmission.

Hi there. There is only 1 catalytic converter that requires the O2 sensor to work with it. The other two are a catalytic converter to help with emissions and a resonating chamber to quieten the exhaust before the muffler. The front catalytic converter will have an O2 sensor before it and an O2 sensor after it. That is the catalytic converter that you will need to replace. If you need further assistance with your vehicle, then seek out a professional, such as one from YourMechanic, to help you with the catalytic converter replacement.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. My engine sensor code said my catalytic convertor went out. Do I have replace all three or only one?

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: 93 Mercury Tracer - starts and runs well. Reverse and low gears seem to work ok, but I haven't gotten it to shift into drive.

Hi there. In older automatic transmissions, a common problem that causes issues like you've described is when inner seals begin to fail. If this is the case, you'll have to have the transmission rebuilt (which might be a better idea...

Q: My 2004 Mitsubishi Lancer started smoking and ticking and will not go above 20 mph.

Hello. There are a lot of things that can cause this. Most of the time if you have a ticking noise with smoke then you need to check for a misfire. I would usually start by scanning the computer for...

Q: Okay, my ignition is spinning loose and the car is stuck with the auxiliary on but wont start has no pressure.

Hi there. If the ignition switch is moving around, then the tabs that lock the switch in place on the switch are either broken or damaged. I recommend replacing the ignition switch. If you need further assistance with replacing the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...