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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Tacoma trouble light P0420 Catalyst system efficiency | 14Relevance | 5 years ago | iboughtavw | Submit Your Question HERE | |
| vw polo 1,2 12v 3cyl 2003 60000 miles. was sitting in garage 10 years before i got it (iam driving it 4 years since i got it) scotty i had p0420 then i have my catalyst removed to solve it (opened it and remove the inside stuff and close it) and i have check engine on now again (with codes for o2 sensor circuit, evap and fuel presure) those codes come and go sometimes...+ i did install an o2 spacer-adaptor to fool the downstream sensor. and i changed the upstream sensor with an ngk one (new) and sometimes i got code for it too..i did a test to the upst ... | |||||
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 14Relevance | 5 years ago | Christian_P | Submit Your Question HERE | |
| Hi, I have a 2005 Toyota Tacoma V6 4.0 4x4 Crew Cab with 235,000km (145,000 miles) showing codes P0430 and p0420 at the same time. I have since tried catalytic converter cleaner as well as replacing a very rusty muffler (needed to be done regardless) hoping that either the cats needed to be cleaned a bit, or that the muffler was allowing air to mess with the O2 sensors causing the codes to trip. I cancelled the codes but they have reappeared as it seems that I haven’t solved the issue. I am thinking I should replace the O2 sensors as the next cheapest o ... | |||||
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 14Relevance | 5 years ago | Thekleb | Submit Your Question HERE | |
| I have a 1999 toyota 4runner V6. I bought it with no exhaust 1 year ago and got a brand new cat and both oxygen sensors. It was fine for a year and I recently got p0420 catalytic converter below threshold bank 1. My bank 1 sensor 1 oxygen sensor voltage stays at a steady .65 volts and bank 1 sensor 2 fluctuates rapidly from .04-.83 volts. Is the sensor 1 supposed to fluctuate as well? Or is that supposed to remain steady. I don't see how the cat could've gone bad in 1 year, I hadn't been running lean or anything. It is a good magnaflow cat. | |||||
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 14Relevance | 5 years ago | Deadman1998 | Submit Your Question HERE | |
| I have a 2002 hinda with code p0420 I have tried cat clean didn't work I going to try a o2 sensor spacer which would be the best on and do they work I live in wv so no emissions test | |||||
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 14Relevance | 5 years ago | Whatchamacallit | Submit Your Question HERE | |
| ... Usually, if the catalytic converter is damaged the Sensor 2 readings will roughly follow the Sensor 1 readings, I.e. fluctuate up and down. You say Bank 1 Sensor 2 flatlines at 0.035V, however, which is not normal. Check the wiring, but also try swapping O2 sensors with the known good ones and see if the downstream sensor still flatlines as 0.035V. If it does - then it’s not the sensor. See p0420 troubleshooting below: | |||||
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