I have been driving this car with regular 87 gas from last 3 years (premium gas is recommended for the car thou) dumb of me🤦‍♂️
I have got engine light many times but goes off automatically within couple days but this time its there from last one week and its concerning me. Got alarm code P0420 catalytic convertor below thresold. What do you think will be easy fix?
Changing O2 sensors? Since i was putting regular gas from 3 years
I just added Fuel injector cleaner in the tank, went on a drive and engine light is gone FOR NOW.
Do you recommend any additive for catalytic convertor cleaner?
+1 to @Tester , that is the reliable method to check the converter. From what I have seen, VW converters seem to go out at about 100,000 miles, ~160,000 km, yours may be failing early.
Your mechanic should test the entire system properly and come up with a determination, not just check things one by one. He should first verify that the engine is in proper running condition and that there are no misfires and that the fuel injection system is running within spec. He should check all the oxygen sensors or air/fuel ratio sensors to make sure they are reporting properly. He should check the exhaust system for leaks, and then he should check the catalytic converter operation to test its efficiency. Except for maybe inspecting the exhaust, all these things can be done from the driver’s seat without opening the hood.
On many cars, the cat can be unbolted, which would allow you to try cleaning it with carburetor cleaner or a similar solvent. Although many people say you cannot clean a cat to restore lost performance, the truth is that if it is marginal but still somewhat effective, pulling and cleaning it could be sufficient to get the car through emissions testing without having to buy another one.
There is a well known YouTube personality/ mechanic that says he’s seen them come back to life after removing them and then soaking in soapy detergent water overnight.
I had the dreaded weak Cat code about three years ago on my 2000 Tacoma. I went on YouTube and searched the $7 ( or whatever price) capacitor/ diode trick. No check engine light ever since.