A poorly maintained car will run less efficiently, burn more gas, and cost you more money in the long run. It started with a rattling cat and a few days later the check engine light came on with the p0420. As long as the car was ran normally, it ran great. I am a auto tech with over 25 years experience, there are a few things everyone here needs to know. The P0420 code does in fact indicate that the Catalytic converter is not functioning correctly, however it also can indicate a bad downstream O2 sensor. I'm sorry not that easy.
Thx For those of you who have replaced their cats and all this other and still get the code. Check that the waveform is pretty steady. Price tag of 400 and up for the right converter. I lot of people have the same problem that we do, some changed everything related to emission system. Next I tried Techron, Lucas oil and cleaned the air filter. Two days later it was back on.
So now after checking for vacume leaks and cleaning connectors. The less they advertise and the larger long term return customer base the better the shop. Blew out the wells where the plugs are, found a lot of water in 2. It's time to replace it. Brass bristle brushed, steel wooled and soaked in gas. The only exhaust system problem I'm aware of is a hole in the muffler, just haven't had a chance to replace it.
If your car's check engine light is on, get that code read in case it's a P0420. Not good economy, especially since you may actually be replacing quality working parts with Chinese junk that will soon break. Common mistakes when diagnosing the P0420 code: The most common mistake is replacing the oxygen sensors before completing the diagnostic process. Which may include the use of scan tools, digital multi-meter, access to the proper repair information, and other tools and test equipment. So i was wondering if my cat.
I live in a county in Ohio that requires an emmissions inspection. I got the P420 code and then transmission related codes. Recently i have had the check engine light come on in my car. Afterwords I made a considerable mileage So far I never see the check engine warning again :D my truck is a 2005 expedition. Now I am being told again by another dealership that it sounds like a warranty issue.
The rear o2 sensor fluctuates between. Thx for the help on this guys!! I do not want to to trial and error as this could be cost prohibited and as we all know times are not that prosperous. If the downstream oxygen sensor is working properly, and there isn't an issue with the catalytic converter, its readings should remain steady. Well first I changed two o2 sensors and my temperature sensor. Please help I just replaced my crankshaft position sensor, o2 sensor, and camshaft position sensor. One thing also that people have to have in mind is that L2 sensor corrects what L1 misses, so if the L2 is not working properly this most likely would fire up the Check engine light. It was on before and had a p0300 so I changed the wires, plugs, cap and rotor.
To do that, you'll need access to a scan tool or oscilliscope. A mixture issue can lead to catalytic converter failure, and if you are forced to buy one, it'd be pretty unpleasant to just ruin that one and have to replace it again! Is there a separate code for the o2 mix sensors on the exh manifold or do you need a scope to determine proper operation of sensor? I went back to the dealer and he said its the Catalyst System Eficiency Below threshold bank 1 P0420 code. Need to check Air Flow sensor Fuel Pressure psi 47-50 psi. I'm not seeing anything online about this valve with the P0420 trouble code and would like to have this fixed myself well. The temperature at the exit should be in the neighborhood of 100 degrees Fahrenheit hotter when the engine is fully warmed up and you have the engine running at about 2,500 rpm. But can this problem be fixed by just fixing the misfire or is this a separate problem that will definitely need to be addressed.
Inspect and adjust drive belt. They claim they put in new o2 sensors but who knows. Lack of power after vehicle warms up. I replaced the down stream O2 sensor. Any other ideas to try? What is the likelihood that I will pass the inspection with a tailpipe inspection with problems related to that code.