You have two cats bank 1 and bank 2. Getting mine fixedtomorrow at 10am, I cant wait. The cumulative volume airflow sensor output frequency for every 2 seconds is higher than 4,000 Hz. You will need to have it fixed before your vehicle inspection. The pipes then join together in one exhaust pipe after the cats and into the muffler. Ive asked around and did my research and I heard i. The o2 sensors are a cheap start though.
Many manufacturers give a five year, unlimited mileage warranty on these items. Valve clearance less than recommended. It sounded like what he said but maybe not. P0421 is Warm Up Catalyst Efficiency Below Threshold Bank 1 Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be according to specs. This indicates that the front sensor is not active or the two sensors are tracking in parallel. When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.
I found out a little more. Thanks for the comments and suggestions. If the P0421 code was the only code stored in the system, the mechanic may begin diagnosing this issue by taking a look at the exhaust system. The list of automotive Makes at the right edge of the screen. Causes: A code P0421 may mean that one or more of the following has happened: The catalytic converter is no longer functioning properly An oxygen sensor is not reading functioning properly A sparkplug is fouled up Possible Solutions: Measure the voltage at the oxygen sensor on Bank 1 the rear sensor, or the sensor after the converter.
In fact, it would be a good idea to test each oxygen O2 sensor while you're at it. A three way catalyst converter Manifold with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. Many manufacturers give a five year, unlimited mileage warranty on these items. Common mistakes when diagnosing the P0421 code A common mistake that a mechanic could make when diagnosing a P0421 code would be skipping over the full diagnostic and just replacing the catalytic converter. A proper combustion mixture goes a long way to cleaning the exhaust gasses even before they get to the cat. I was suspicious of that.
See product for application and installation details. The car does have quite a few miles and has been driven all over. If the ignition system is in poor condition or recently repaired because of misfire it could indicate that the front converter is now burnt up and requires replacement. If the front O2 sensor is not active, its replacement might solve your problem. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem.
This has been working for 20 odd years, but the last few years, just barely. You may have two of them in your system. Would you like to answer one of these instead? Bank one is the side of the engine with the number 1 cylinder. In most areas if it is on, the car will automatically fail emissions. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 on this site the. But this usually makes them last longer. It may take a couple of treatments to do the job.
I have to pass the inspection to be allowed to get my car registered with new plate stickers. Try the O2 sensors to start. Do not rely on scan tool data alone. If the P0421 Mitsubishi code is combined with other codes, try fixing the other codes first. Mechanic 3 that I spoke with today was the one the only one that said that my car had 2 catalitic converters.
Volume airflow sensor output frequency is between 69 and 169 Hz. New properly calibrated O2 sensors will aid your engine computer to set the proper combustion mixture. It's worth checking into Posted on Nov 27, 2009 P0421 is cat efficiency low on bank 2. Well, this time, it didn't pass inspection because the light won't go off. Getting mine fixed tomorrow at 10am, I cant wait. My car has two cats. Remember to install new or old washers.