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: What does this code mean P0420 ? 1997 Chevy Express 1500

Hello - the P0420 code means the catalytic converter has lost it's ability to burn residual fuel. This could be due to an engine condition that has clogged the catalyst, or a failing oxygen sensor that is not adequately monitoring...

Q: 06 mazda3 runs idles wont accelerate no major engine codes one forlow coolant adn the other for catylist below effeciancy but noth

Be sure to maintain adequate coolant in the engine. If you suspect a leak, request a coolant leak diagnostic. The diagnostic trouble code referring to catalyst efficiency, although that issue should be resolved in a check engine light diagnostic, is...

Q: Engine light is on, suspect catalytic converter

If your catalytic converter was having an issue as diagnosed by the dealership and it has been modified to correct the issue with no success, I would start by recommending a replacement of the catalytic converter. It would also be...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.