Can a bad catalytic converter cause an oxygen sensor to go bad?
In 99.5% of the cases, this code means that the catalytic converter itself is bad and must be replaced. However, I see questions all the time on auto forums asking if a new oxygen sensor will fix the problem.
Do you have to replace the catalytic converter?
If they replace the catalytic converter, they are going to insist on replacing the oxygen sensors as well or they won’t stand behind their work.
When does an O2 sensor set a trouble code?
If it’s not switching rapidly, the ECM will set an O2 sensor related trouble code If the upstream and downstream oxygens sensors are both switching from rich to lean, that’s the sign of a dead catalytic converter. An exhaust system leak really screws up the P0420 testing routing.
Do you need to change oxygen sensor in OBD 2?
I am guessing that if you check your owners manual on a 2006 OBD 2 vehicle, it will tell you that you should be changing your oxygen sensors about now. Therefore, there is no decision. If they replace the catalytic converter, they are going to insist on replacing the oxygen sensors as well or they won’t stand behind their work.
What is a bad O2 sensor?
Bad O2 sensors are one of those car problems that most drivers tend to postpone until more serious problems occur. These symptoms will rarely cause any immediate damage, but over time, if left unattended, they can cause damage to the engine and other systems mainly through improper air-fuel mixture.
What is a catalyst monitor sensor?
Catalyst sensors are often used to detect hydrocarbons but rely on the presence of oxygen to function. How do catalyst sensors work. Catalyst sensors have two basic elements: a detector which contains a catalytic material sensitive to flammable gases, and a compensator element which is inert.
How does an oxygen sensor work?
Oxygen sensors work by producing their own voltage when they get hot (approximately 600°F). On the tip of the oxygen sensor that plugs into the exhaust manifold is a zirconium ceramic bulb.
What is an O2 sensor?
An O2 sensor is an electronic sensor designed to measure the oxygen level in the exhaust fumes that exit the engine after combustion. All combustion engines burn fuel by mixing it with oxygen, which is essential to run the engine.
In 99.5% of the cases, this code means that the catalytic converter itself is bad and must be replaced. However, I see questions all the time on auto forums asking if a new oxygen sensor will fix the problem.
If it’s not switching rapidly, the ECM will set an O2 sensor related trouble code If the upstream and downstream oxygens sensors are both switching from rich to lean, that’s the sign of a dead catalytic converter. An exhaust system leak really screws up the P0420 testing routing.
How can I tell if my catalytic converter is leaking?
Check for exhaust leaks ahead of the catalytic converter Exhaust leaks can skew the pre and post converter O2 sensor readings and cause either of the converter codes. Raise the vehicle and look for signs of soot around every exhaust pipe connection.
Can a bad O2 sensor indicate a bad cat?
A bad O2 sensor will indicate that the catalytic converter is bad. If the code indicates a bad cat…then further tests need to be run to determine if it’s a bad O2 sensor or a bad cat. Good mechanics know how to do this. Cavell July 6, 2016, 3:57am #12 I assume next argument will concern using oem cat or aftermarket cat and/or new oxy sensor.
What does the sensor on the catalytic converter do?
The downstream oxygen sensor, on the other hand, should show very little movement. It’s testing the catalytic converter to see if it’s storing oxygen during rich events and then using the oxygen during lean events.
What causes the P0420 oxygen sensor to read lean?
If the upstream and downstream oxygens sensors are both switching from rich to lean, that’s the sign of a dead catalytic converter. An exhaust system leak really screws up the P0420 testing routing. An exhaust leak near the upstream sensor can cause the downstream sensor to read a steady lean condition.