Please help asap my smog is due now. It has also consuming me more gasoline and every time I'm driving my car it skips when i push on the gas and the service engine light blinks. Please guild us what we have to repair and it would require how much cost for parts. I just bought a new O2 sensor,hoping to have it replaced only for me to realize the 2nd code. Got some new plugs, and it has been two days, and not a p0420 code. If so you have some issues. Not a technician, just leaning.
This code means that the catalytic converter is not cleaning the exhaust properly or the oxygen sensors are sending false info to the computer. If you've come to this site you most likely already know that you have a P0420 code. Any suggestions on what to do next? Last six months geting po420 no symptoms good gas mileage engine runs good. The car has 195K on it, but it runs just fine. I was using Gasoline that had 12% Ethanol and didn't know it!! As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase. That went bad in 2 weeks.
I can sell you some if you need it. The other likely thing is the rear O2 oxygen sensor is no longer working properly. So now after checking for vacume leaks and cleaning connectors. I went back to the dealer and he said its the Catalyst System Eficiency Below threshold bank 1 P0420 code. I purchased a direct fit converter and had it installed and my car no longer has a po420 code and passed the P.
Dear Sir , Recently the engine check light have been on. Remove the upstream and downstream O2 sensor connectors: this is optional, but depending on your vehicle is better to keep the sensor wiring safe from an accidental burn. I am not convinced that I really have a true problem with the Catalytic converter. I took it there and they checked it, and said it was the converter causing the code and it was not working properly. For most people the first sign that anything is wrong at all is the service engine soon light coming on.
The code diagnostic machine pulled was P0171!! The list of automotive Makes at the right edge of the screen. . Since then in order I replaced the cat, both O2 sensors, fuel filter, used fuel injector cleaner in the tank, cleaned and regapped plugs and last I thought for sure would work I used the plug defowler trick on the aft 02 sensor. After getting my 1st P0420 at 104K miles and the factory-original catalytic, I replaced the catalytic with a Walker 16385 direct fit best? I have spent the last hour or so reading all the posts. Thank you for your time and posting this site! Thankfully the new one fit.
I'm just wondering if anyone has ever heard of the head gasket leaking coolant into the exhaust system causing the catalytic converter to go bad??? But can this problem be fixed by just fixing the misfire or is this a separate problem that will definitely need to be addressed. Does anyone have any Ideas? I think that may have actually helped. Any help would be greatly appriciated. I could not afford it so I parked the car and started saving money. Well thank God some finally did! I am getting different things told to me the one mech. Don't accidentally take the temperature of heat shields, pipe only. First an intermittent misfire after an highway trip then idling for 20 min.
Took a hard right turn and pipe broke right in front of catalytic converter. Best of luck later Two months ago I brought my 2001 Sienna to the dealer for engine check light on. Rember your cat converter must be a calif emissions approved cat or your light and smog will not pass. When ever I get the P0240 code I just take out the Mass Air Flow Sensor, clean it with electronics cleaner and pop it back it. I have not replaced the rear O2 sensor.
Apparently the sensors are supposed to switch on and off like this? Mechanics fix cars to make a living and help people. And my gas mileage shot up immensely. Wondering if water remover 2x strength could of done this. I replaced the down stream O2 sensor. And since then it has been struggle with my car. I had the same code P0420 bank 1 efficiency on a 2005 ram 1500 hemi.
I'm going to the dealership tomorrow to have them check the code and see what happens!!! Thanks for any help before I change expensive parts that aren't needed. After doing more research I found a. I have seen the same guy put 4 cats on all not meeeting cal emission. It comes on after filling the tank with gas, and goes off after filling the tank with gas. If the actual backpressure exceeds the maximum allowable value, there is a restriction in either in the converter, or somewhere else in the exhaust system. Unburned fuel from a misfire is a big cause of catalytic converter meltdowns, as well as just old age.
Wished I had taken it to the dealer 1st - I would have saved the 02 and diaganose cost. Next the car was gaining speed by itself and that was traced to a leaking intake seal behind the throttle body causing a lean condition codes after getting the caddy dealership to do all this work the car ran great but idling in traffic set a 0420 code. I reluctantly agreed, but light came up again. I have a 2007 Honda Odyssey. In December 2010, check engine light came on, code P0420. This can be confirmed by the fact that its temperature remains below 400 deg F 200 deg C even after expended periods of driving. This threshold is traced by a Catalyst Monitoring Oxygen Sensor positioned on or near the outlet of the Catalytic Converter.