Q: Fixing catalytic converter low threshold issue

asked by on

How to fix catalytic converter low threshold issue?

I fix that every week on people’s cars because they have got to get their cars inspected and they get that stupid code "catalytic converter below efficiency threshold."

There are so many things that can do it, but I’ve had fantastic luck by putting a very good cleaner in the gas tank and then driving it around. There are certain ones out there like Cataclean and different brands.

I have had good luck using lacquer thinner. I go to an automotive paint store and buy a gallon of lacquer thinner and mix it with at least nine gallons of gasoline and drive it around. I just did that with a guy’s car that failed in emissions and I said "you drive it." He came back the next day and I plugged my computer and put a test and got it fixed. Pray that will fix it, because if it doesn’t, it is very expensive. You don’t just want to get out and guess with the new catalytic converter, because if the catalytic converter goes bad, normally, it’s because something made it go bad and if you are replacing it with a new one might not fix the problem.

If you are sure the catalytic converter is the problem, you’d better find a mechanic to replace the catalytic converter for you. Otherwise, I would have a comprehensive inspection done on the car to ensure that you are replacing the right part.

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. Fixing catalytic converter low threshold issue

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: Recently replaced engine due to water damage. Now car shakes at idle and check engine light flashes.

If your catalyst is bad then I would suggest replacing it first and then clear codes and see how engine runs afterwards and if it needs further diagnosis.

Q: What cause a catilac converter in 2009 nessain murnao go bad

There can be a few different reasons for a catalytic converter to fail. Your engine running too rich or lean or coolant in exhaust from a blown head gasket can cause failure. Also a defective converter that breaks apart and...

Q: Acceleration issue, RPMs increase but not speed

If your car is revving up but not moving, or is slow at gaining speed, then you have a slipping clutch. If you have a manual or automatic transmission it will still be a clutch issue. A mechanic with experience...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.