i have replaced the 2 02 sensors but i am still getting the same code, p0420. But the random misfire code, P0300 remained. The material above is designed to give our customers a better insight to their need of . However, there are still other less-costly causes for a trouble code P0420. =====Claim your FREE engine code eraser https://free.nonda.co =====Engine Code P0430 Saving Repair Parts:C. Only show this user. So far I haven't replaced either and still drive. As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Such as: Failing oxygen sensor (remember that's always a possibility). Check for any exhaust leaks before the catalytic converter. Two years ago, I had one of the catalytic converters replaced with an aftermarket one (due to an emissions test failure which indicated that this was the issue). Ripping and replacing with a California emissions spec'd CAT is not an option. And this could result in an increasing level of harmful pollutants being emitted by your car. P0430 Code can be accompanied most times with . The presence of knocking noise in cold could indicate leaks in exhaust manifold eventually triggering the catalyst inefficiency code. 1)The codes P0430 and p0420 indicate your catalytic converter efficeniency is reduced. I had the constant P0430, bank 2 catalyst, coming on before replaced. Jun 19, 2016. It seems like a lot to replace and cost over $400. You like your car, so you take it to be looked at. "Accidentally" bought an 05 F150 Lariate at auction. As far as I understand, the pre-cat O2 sensors are part of the process where the engine decides if the fuel mixture is to lean or rich, so faulty pre-cat O2 sensors can lead to this trouble code. I was quoted over $3,700 to replace both of them with Toyota OEM parts . Vocational, Technical or Tra. So your car or truck is running well, but that check engine light is on, with a code p0420 or p0430, and related catalyst efficiency below threshold codes. Test Drive. This p0420 code can be caused by the catalytic converter, the oxygen sensors before and after replacing the catalytic converter. and you might need that expensive replacement. V8 catalytic . The engine ran very well, idled smoothly and could rev to 6k rpm. Sep 15, 2021 (Edited) Only show this user. The most common P0420 and P0430 cause is a clogged catalytic converter filter, which requires replacing the entire catalytic converter. Same codes P0420 and P0430. I replaced rattling catalytic converts and replaced both downstream O2 sensors. Oxygen Sensor - The P0430 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings. They are separate converters. I've changed oil 5-30 synth blend, sparkplugs Motorcraft, air filter, PVC valve, cleaned throttle . No repair history. Have the leak repaired. Installed direct fit EASTERN CATS. More often than not, experts would say that 99% of the time, a P0430 code (or P0420) should tell you if the catalytic converter is faulty. If this is the case & you have given up finding the cause of the CEL P0420, you can space the rear O2 sensor back out of the exhaust flow with a sparkplug non-fouler. 24,251 satisfied customers Had my truck Straight piped now code is show p4030 and my I have had that code pop up once before, but it cleared on its own. The third cat has no monitor. The pre-cat sensor should switch rich/lean. home . The upstream sensors should change between "rich and "lean" about two times per second. It signifies that the catalytic converter of your vehicle is not functioning properly. 430 is a bad catalytic converter for bank 2. Recommendation/Instructions If you believe the catalytic converter has failed with no apparent reason, it is recommended to inspect for a poor crimp for the coil grounds terminal on the engine block for the bank with the concern. Just over 100k miles. It could mean a bum converter, bad 02 sensor upstream or downstream or an exhaust leak. This causes certain cylinders to lay dormant when coasting . I reset ECM twice. How to determine if P0430 is O2 or catalytic converter. 06/06 build date, purchased 07/06. 12. When the ECU detects a poor efficiency in the catalyst system for bank2, the OBD2 data problem code P0430 is saved in memory by the OBD2 system (the bank of cylinders not containing cylinder1). If you find a P0420 code in your Subaru or Honda, it's most likely the catalytic converter to blame. It failed a state inspection, because the catalytic converter had been damaged, presumably. The cat may be toast, but trying to figure out why the has happened again after only a year. If you see bubbles blowing, you've found the leak. Technicians may encounter a concern where the catalytic converter has come apart or has set a P0420 and/or P0430. You say P0430 which is a catalyst below efficiency code on bank 2. Bank 2 is the passenger side. Many drivers simply don't push their vehicles hard enough to heat the catalytic converter to its most-efficient temperature—between 800 °F (426 °C) and 1,832 °F (1,000 °C)—leading to premature failure. Their diagnose was code p0141, oxygen sensor heater, o2 sensor had to be replaced. More often than not, experts would say that 99% of the time, a P0430 code (or P0420) should tell you if the catalytic converter is faulty. The CEL tripped a few days after using some Techron fuel . I have not replaced the rear O2 sensor. It failed a state inspection, because the catalytic converter had been damaged, presumably from running lean prior to the injector problem being diagnosed. Replacing the cat is much like treating the symptom rather than the cause. There are also no exhaust leaks. It is not a sensor at all. Codes P0420 & … Continue reading "Replaced Catalytic Converter Still Have P0420" Repair costs are estimated to be between $400 and $1000. It is the precious metals are worn out in the converter. Do you have another code for an O2 sensor? FYI, it takes several "drive cycles" before the readiness monitors are set. The function of the catalytic converter is to break down harmful pollutants that are created by your vehicle during the combustion cycle and convert them into less harmful gases. Over the winter the injectors were replaced, and all 4 O2 sensors. Table of Contents Trying to resolve this issue for some time now I've got "Catalyst System Efficiency Below Threshold (Bank 2)" code and replaced after-cat O2 sensor as first troubleshooting step. Oct 31, 2016 (Edited) Only show this user. Viewing the PID data on the scan tool im used to comparing the voltage switching from the pre and post cat o2 sensors but this system uses a UEGO sensor for the pre cat sensor and . Repair time is estimated to take 1-2 days. Trouble Code P0420 is "Catalyst System Efficiency Below Threshold." This coded sets if the computer see similar readings from both the pre- and post- converter oxy gen sensors. I took it to a mechanic who told me that . . Of course it came back. Click to expand. Internal engine damage resulting in high oil consumption and/or a leaking Head Gasket has damaged the Catalytic Converter. That said, there are a few other things to inspect closely while you're there. Improper ignition timing Engine Control Module (ECM) Tech notes. Daily driver and weekend wheeler (more like bi-annually these days ). . I don't have any (visible) leaks and no loss of power. Alright guys, I had the catalytic converter replaced because it was completely gutted. I have a 2013 F-250 (6.2L gas) with 160,000km. I cleared it, thinking it was just a fluke. This is extremely common on your truck. After 80 mi. But the post-cat sensor should give a fairly steady reading, indicating that the converter is doing it's job. The P0430 code simply means the catalytic system isn't operating as efficiently as it should. The code itself says the o2 sensor is working, as it detected the converter is below efficiency thresholds. P0430 is a common diagnostic trouble code (DTC) that stands for "Catalyst system efficiency is below threshold". When the ECM see a active rear 02 sensor , it see this as a insufficient catalytic convertor and codes a P0420. Then clear the P0420 code and drive the vehicle to see if it returns. Answer (1 of 4): Pretty much anything that could cause an incorrect balance in the exhaust stream, a defective or "poisoned" O2 sensor, low fuel pressure, weak or intermittent ignition spark, defective fuel injector all the way to a leaky head gasket or intake manifold, and the list goes on. - Put new plugs and wires in and found that both sparkplugs on the rear cylinders had some of the ceramic missing. If I replace o2 sensors and still have issues and have to truly replace the catalytic converter, is the new catalytic converter going to come with o2 sensors? Source: www.evoqueforums.net. Measure the diameter of the tip portion of the oxygen sensor that extends past the threads. the_twig_187. Typically the P0430 has data behind it (Bank #, Sensor #) and is usually related to either an O2 sensor being bad or a Mass Airflow Sensor being dirty. You choke on the estimate of $1400 or more to replace the converter on your car. 122,000 on the ODO. Stack Exchange Network. Dec 15, 2021 (Edited) Only show this user. Now, I am attempting another emissions test, and the codes being provided by the shop are P0420B and P0430. Over the winter the injectors were replaced, and all 4 O2 sensors. -replaced pre and post o2 sensors on Bank 1 (OEM DENSO BRAND NEW)-replaced catalytic converter with aftermarket "weld in" style (didnt work)-since aftermarket cat didnt work, i purchased a used exhaust manifold w/ 12k miles from a friend who switched to headers. Most people think the only way to know for sure is to replace the catalytic converter, reset the check engine light, and see if it comes back on. You will need to drill out one (1/2" drill bit) so the O2 sensor will screw into it. The code means a "converter low efficiency" Fault code. Put some Berryman's infector clean in and filled tank. It started last year with me. This means that every time you turn on your vehicle, you're adding more pollution to the environment than you should. If the cat fails, the O2 sensor will report P0420 or P0430 depending on which bank is affected. Defective Catalytic Converter. Defective Catalytic Converter. Replacing the oxygen (O2) sensors may sometimes fix the code, but . I cleared it, thinking it was just a fluke. They are cheap ($5) & come 2 in a package. The code itself says the o2 sensor is working, as it detected the converter is below efficiency thresholds. The catalytic converters are integrated into the manifold. 2005 Ford escape, I can't imagine the cat is bad … read more Ron Z. Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix . 1. After the installation, I cleared the codes (P0430 and P0420) with my Scan Gauge II, and took it for a test drive. The 420/430 are saying Catalytic converter system, efficiency below threshold for both sides. July 29, 2015 at 5:46 am #835818 Will Participant Quote; Share this post. . 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