If you are going to make repair yourself at least use a direct fit part that was designed for your application. I read the previous posts and since the truck is only 4 almost 5 years old I've visually checked the catalytic converter and looked for exhaust leaks. Advice: with high mileage vehicle owners. If light still on - 5. On the other hand, when you are looking for internal disintegration, you can check by using a rubber mallet to lightly rap the converter.
Not sure why my car would not start my husband changed my fuel pump and then turned out to need a new engnition coil. The light came back on 3 days later. Then another problem came up with the 0420 code. When reality sets in people whit quality diagnostics are worth more than parts changers will ever be worth. If you also have any other code related to the ignition system, emissions system or fuel system then you should start diagnosing them first. They make money and have you return back once you replace it with another wrong universial Cat. Any way I replaced old set with new set and cleared the P0420 error code by using the scanner.
The reality is there is still something wrong and your car needs attention in order to be in excellent running condition. Amy I have a 2002 grand am V6 that has the P0420 code. . Check for a dirty fuel filter and proper fuel pressure Catalyst system efficiency below threshold bank 1. Some fail because they want to.
Only in calif we have tight Emission standereds??? For one reason or another the system isn't able to get enough air to run properly, or at least it thinks it that is the case. The easiest thing to do first is a visual check of things. I do hear a whistling noise when i first start out when its cold out then it goes away. This can be done simply by banging it with your palm. Then after all that put in one gallon of Lacquer Thinner, and one bottle of Chevron Pro Guard, cleans the fuel injectors.
If the voltage of the downstream O2 sensor is constantly jumping between 0. As the wise indian once said, look for signs,i hope this helps Things you might want to check,ok you know there is a problem on the left side, the first thing i would do is pull the plugs on the left side bank i and see how they look,things that it could be are a bad wire,bad plug,leaking intake manifold on that side,leaking exaust manifold on that side or like in my case bad exaust valve seal or to much blowby in a cyclinder on that side, whitch would show on one of the plugs looking oily than the rest on that side but you said you didn't see any smoke so we will rule that out,so plugs would be a good place to start. The comp … uter unit is faulty Symptoms. Anyone have any advice or anyway I can get this fixed cheap and legal? Well I just had a ac converter I think that was what you call it put on and picked up today and my ac is finally working but on the way home today it had a engine light pop up. 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. Repeat the procedure several times. Sounds like you have P0172, not 127.
Should I change all the Oxygen sensors? Well thank God some finally did! If Bad cat would not cause poor mileage could it still be sluggish front O2 sensor causing poor mileage and setting the po420 code? I replaced all gaskets, did not help. Which can be caused by a number of issues. It is very obvious by all the questions here that haven't even been acknowledge totally ignored that the writer of this article isn't serious about helping anymore than what he's given here in the above article. The code has been cleared at least six times and comes back only when idling hot in traffic. 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. Hope this helps with your cat issues I had two codes thrown for cylinder misfires, smelled sulfur rotten eggs occassionally while driving, then car developed a rough idle at stops which suddenly started happening and then stopped about a week later , and it wouldn't shift correctly when taking off from stops occassionally. Should have brought the job to a freelance mechanic who knows how to cut out the corroded parts and leave the old cat converter in place, which no doubt had way more Pt than the replacement.
This code is generic and is the same on all vehicles. Also used a better grade of gas and put in an additive. Id start with the leak checks and a tuneup on high mileage vehicles. 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. Approaching 200K a series of issues have cropped up with this car.
I am having below codes on my 2003 sienna from 10,000 miles now but it does not give me any problem though its check engine light is on Sienna fault codes: P0171 Bank1 system too lean P0174 Bank2 system too lean confirmed P0420 Catalyst System Efficiency Below Threshold Bank 1 confirmed P0171 Bank1 system too lean pending I have a 2001 chevy s-10. Basically, anything that leaks oxygen uncontrollably into the converter input will produce P0420. If other codes are present, they must be addressed first. Check engine light comes on for a few days then goes away and comes back on. Then mechanic told me it was upstream 02 sensor1! From reading other posts this is common problem on Camrys and challenging to replace Google procedure as tight location. I went to another shop and using a Mac scan tool discovered there was no data stream coming from the downstream O2 sensor. Most of the time it has to due with 1.
I hate to take it to a professional and potentially waste a lot of money. Mechanic said O2 sensors scanned Ok. I cleared the codes than put about 50 freeway miles on the odometer I believe The comp needs to perform a drive cycle. When it finally started it ran bad. I noticed that instead of max 100 i had like 350 on idle speed which is way off limits.
The car has 195K on it, but it runs just fine. Usually within a short time, or a few miles of driving, the check engine light comes back on. Replacing the oxygen O2 sensors may sometimes fix the code, but in most cases, the catalytic convert needs to be replaced to fix the problem. This type code is very difficult to repair. It is recommended that you address P0420 as soon as possible to keep the cost of the repair to a minimum.