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

asked by on November 10, 2016

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.

Oxygen Sensor Replacement $123.80 - $932.74 Get a Quote
Catalytic Converter Replacement $288.41 - $1959.69 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Brake pedal goes 3/4 down of the way down then catches
The first thing i would check it to make sure the brake pedal to brake booster arm bushing is not worn out. Check the brake pedal free travel with your hand to see if it is more than a 1/2...
dynamic curving lighting stopped working - 2014 Volkswagen Tiguan
Hello. Volkswagen's dynamic curved lighting does not utilize an extra bulb despite all the confusion out there on the topic. The headlights physically swivel 5-15° allowing drivers to see up to 90% better around corners. VW uses servomotors controlled by...
Ignition problems
Hello. If you are losing battery power to particular circuits then most of the time this is caused by a bad ground connection, a failing battery cable (https://www.yourmechanic.com/services/battery-cable-replacement), or it may be a bad transmission position sensor (https://www.yourmechanic.com/services/transmission-position-sensor-switch-replacement). It is...
Clunking noises driving at low speeds or over bumps
A clunking noise when hitting bumps can be caused by worn out struts (https://www.yourmechanic.com/services/strut-assembly-replacement), worn strut mounts, sway bar bushings, steering linkage being worn, or loose components. It would be best to have a certified mechanic actually diagnose the noise....
Check engine light
Hello. P0171 is the trouble code for a lean condition at bank 1. This can be caused by a wide variety of issues, primarily issues with the engine management or fuel systems, and therefore can sometimes be difficult to diagnose....
When I fill my taknk up gas is on the ground under my car
Of course it is possible that a leak in a steel fuel supply line (due to corrosion), or a rubber hose, occurred after the pump was put in, but that would be quite a coincidence. More likely, if the leak...
Engine light on
Check engine lights are just an indication to the operator that there has been a failure in the system and the computer will store a failure code for the failure. The problem you are having may be a misfire in...
Why is my 1997 Nissan Maxima bogging down and stalling.
Hi there. Though there are a lot of reasons that will cause this most of the time on this vehicle it is due to a failing crank or cam sensor. both are common failures. I usually start by scanning the...
I have a Santa Fe and it has been sputtering and jerking when I come to a complete stop, shortly after dies and will not start bac
The problem sounds like you are flooding out on fuel or have a stuck open valve for the variable intake. Since the vehicle will not restart you will need to have mechanic like one from YourMechanic come to you and...

Related articles

Symptoms of a Bad or Failing Evaporator Temperature Sensor (Switch)
Common signs include lack of cold air coming from AC, temperature fluctuations, and the AC compressor not activating.
How to Replace an Anti-Lock Brake Fluid Level Sensor on Most Modern Cars
The anti-lock brake (ABS) system has a fluid level sensor that fails when the warning light comes on or if there is low fluid in the reservoir.
How to Replace an Evaporator Temperature Sensor (Switch)
The air conditioning system has an evaporator temperature sensor that fails when there is no cold air or the air conditioning is inconsistent.