And which one should I take care of first. I found out a little more. Catalytic converter temperatures must reach at least 800-degrees Fahrenheit. So long story short, my check-engine light has been coming up every now and again for the last couple months with the code P0421, which a shop has confirmed I need a new manifold catalytic converter for they ruled out any problems with O2 sensors. Last week I got my first P0421 fault code and also briefly P0300.
The P0421 code is set if the quotent of the frequency of the rear O2 sensor divided by the frequency of the front O2 sensor is above 0. Deleware Emissions Qualification or something? Do many repair shops allow you to bring a part obtained somewhere else for them to install? Always something with this car. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it. We took the car in for emissions and the cat and sensors were bad. More info on the vehicle; make, model, year, motor size, of miles, etc. Supposedly, as previous owner says, that has someth.
Dealer or salvage yard is a source. When engine is revved up, the output voltage should repeat zero volt and 0. I took my car to get it diagnosed and the codes p0421 and p0401 popped up. It may take a couple of treatments to do the job. I can try the coils, but the car is not under warranty. Well, this time, it didn't pass inspection because the light won't go off. Symptoms: You will likely not notice any drivability problems, although there may be symptoms.
They offer practical things you can do to increase your odds, such as putting in a new air filter, making sure the car is fully warmed up, having a full tank of gas, driving the car at freeway speeds for an hour or so to clean out carbon buildup, etc. Either the oxygen sensor s is faulty and is giving an incorrect reading or the catalytic converter is faulty. Either the oxygen sensor s is faulty and is giving an incorrect reading or the catalytic converter is faulty. You could also have leaking fuel injectors that are ok when the engine is hot but throw a code when the engine and the converter is cold. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time. Previously I had a split Air Intake Hose: the big one beside the battery. The thermostat housing is located on the passenger side of the engine.
The two sensors monitor the upstream catalytic converter so this code does not relate to the down stream catalytic converter. Also check for bad fuel injectors. I'll probably replace the fuel pressure regulator as well while I'm at it. I found those sites to be useful that I found with the Google search. I checked for the code and gave me the P0421 I don't know if anyone found the answer to this but im still looking for the right answer. There is no O2 sensor fault code or any other fault code. If this one is slow to heat the system it may cause this code.
Many manufacturers give a five year, unlimited mileage warranty on these items. It is part of the vehicle emissions system. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. Inside the chambers, the air is heated, forcing the oxygen ions to produce energy voltage. So they changed out the coils. Now don't ask yourself; What should you do with P0421 code? This time period would be from when the vehicle is first started until about five to ten minutes later. Especially since the 1st local mechanic didn't say straight out that I needed to replace the part.
If the catalytic converter has failed and the engine is not running properly, severe engine damage can result from continuing to drive the vehicle. If the P0421 code is combined with other codes, try fixing the other codes first. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days. Wanted to share my resolution as it seems so many have the same issues and are almost unresolvable. Lift the hood and pull one of the plug cables a bit so it archs against the block.
How serious is the P0421 code? The misfire clears and it runs like a top for a while. If either sensor isn't working correctly, the car will run rough and the engine will be less efficient. Had a timing belt put on about a month ago and it ran fine, put new spark plugs in , but didn't help the way it runs. Could be caused by:Bad vacuum line or connection between intake and sensorBad sensorBad connector or wire between sensor and computera plugged air filterA plugged exhaust systemAn engine that runs poorly enough to send this sensor out of range. How is the tune up.