Afterwords I made a considerable mileage So far I never see the check engine warning again :D my truck is a 2005 expedition. Drive the vehicle and if and when the light comes back on, more than likely your cat converter is done. Which may include the use of scan tools, digital multi-meter, access to the proper repair information, and other tools and test equipment. A shop where you have to set an appointment is likely to be a good place, it is likely to be busy because they do good work. Next I tried Techron, Lucas oil and cleaned the air filter. A couple years later the underlying condition gets worse and the code returns. Like before, the car still runs good under normal driving, but if you get on it a little hard, it has the same problem as before.
Please guild us what we have to repair and it would require how much cost for parts. Tried after reading tips and put in sea foam and 93 octane. I will update after I bench test the 02 sensor and or replace spark plugs. Check under the hood and car for any air leaks, such as intake manifold, vacuum hoses, exhaust manifold, exhaust leaks 2. Reason being, my brothers 03 camry's light is on and a mechanic scan is and it has cat problems. It is a 2005 Ford Taurus, so I bought it back to the guy who said I had a month warranty and said it was just a misfire and reset the code, not wanting to spend the time taking it to his mechanic, which got me angry and we had some words.
There are places like ebay to buy cheaper sensors but those may be cheaper because they break every year. We put it on and issue resolved. Well one thing i learned about the obd 2 system is that it will point you in the right direction, the po 420 code is for the left bank or side of the motor looking from the drivers seat in a rear wheel drive car,the computer is telling you through the o2 sensor on the left bank or left side of the motor that their is a problem in that area, in my case it was an oil seal on the left bank or side,the exaust valve on number 3 on my 3. Getting all of the routine systems in order is great advice. Now the engine light is on again. I have a 99 gmc sonoma auto with the 4. I have a 2005 Ford Taurus with only 54k miles on it.
No other codes were being stored in the computer's memory. I wanted to make mention that I recently had codes for a bad egr valve and a bad catalytic converter on my 2006 dodge ram 1500. . To fix your particular P0420 issue I encourage you to make sure the engine is performing perfectly, sensors and all before spending the money to replace the catalytic converter. Ie: bad injector, bad spark plug, bad wires or coil pac, etc. There are no intake manifold leaks gaskets and bypass have been replaces 2X , engine uses 1 quart oil per 4K miles, runs smooth, no antifreeze loss whatsoever.
If your vehicle has more than 80k, most likely it is the cat performance. No problem with how the how car runs at all lately,now I am getting the P0420 code again. A week later the light came on again not wanting to go to him I was going to bring it to autozone, but the light turned off by itself in two days. Best of luck later Two months ago I brought my 2001 Sienna to the dealer for engine check light on. So what i did is I empty my tank and filled it back with ethanol Free Gasoline, unplug the battery to erase the codes and Guess what, no more light. About November when the weather gets below 50 degrees F.
However, when I drove the car hard, it would rev up to 5000 rpms and would not shift unless I let off of the gas a little. I have a friend who had a P0420 on a '99 Dodge 1500 and it also wasn't running right. I'm going to the dealership tomorrow to have them check the code and see what happens!!! Does this mean that it is bad or disconnected? I automatically assumed it was the turbo however, i ran the special emissions tool you can get at autozone and it is telling me this same exact code. I'm trying to decide what I should check next or if it's even worth my time and money to try to fix. I'm in the process of contacting Walker's tech support but thought I'd run this by you to give my customer some feedback.
A week or so goes by, light is back on, just after a refuel. Went to Auto Zone and they turned light off. I was traveling, the car was running fine, no work had been done to the car, the milage was low, thought it was likely the loose gas cap problem. Replaced with after market cats which are warranted 5 years. Cat conv are pretty expensive and I'm trying to check other posibilities causing the problem before I have to change the Cat. As long as the car was ran normally, it ran great.
I have at least 5 cars a year either display 420 and sometimes 430 V6 or V8. Converters are killed by poor running engines. Install the sensors and plug them back up, making sure the wires are not stretched tight or against the exhaust. Same issues, replaced cat twice, rear o2 twice, tried upper engine cleaner seafoam , light keeps coming back. Plug in scan tool , emission status now green, problems solved.
Ever since my ceck engine light was on and i checked it and got this exact code P0420 10 and it said this 'Catalytic system efficiency threshhold below bank 1' what could this mean and how much would it cost for me to fix? She finally agreed to let me take care of it. Could anyone tell me where is the cataLic converter in the car and can we fix ourself. After 200 miles I had it retested and still coming up with 1 code, which is. In short: take the P0420 code seriously and give due dilligence to figuring why it has been logged. Take the time and do it right.
The miles on the car is 119000 miles so far. I could not afford it so I parked the car and started saving money. Did some research and found that it could also be a o2 sensor because bad one can decrease mpg by 20% -40%. The new one is just enough better to bring the performance in line. Best thing to do is give vehicle a good tune up and run a tank of high test gas, clear code and see if code stays away. Hello I recently purchased a car and about a week after I got it the engine light came on.