I just purchased a 2000 honda insight with 135,000 and new batteries under warranty about 6,000 miles ago. It is throwing the p0420 code and the owner says it has been doing it since it was new. He said honda cannot fix it. He says it only comes on when its cold outside. I would like to know where to start to fix it?
My own car had free warranty upgrade for the electronics specified in the service bulletin a few years back when the owners paid for a new cat after it repeatedly threw codes.
New hardware is required in the 2000-1 cars but the later ones can be reflashed to alleviate premature codes.
The guy gave me the paper work of what the dealer did and that was one of them. It still throws the code. Any ideas?
You may try some Anti-fouling Sensor Port Plugs to get the sensor tip out the blast. Some are really cheap like a few bucks each but may need some modifications. How to found here.
You may try some Anti-fouling Sensor Port Plugs to get the sensor tip out the blast. Some are really cheap like a few bucks each but may need some modifications. How to found here.
The "found here" link shows the foulers with the stock #42009 found at Autozone. The Insight has three (3) o2 sensors, and this method is used on the 2nd and 3rd sensors ONLY! The P0420 is from the 2nd o2, while the P1420 is from the 3rd sensor.
The 1st sensor is used for your air-fuel ratio, no messing around with that one.
Here is another thread that even has a link for making a wiring-bypass simulator Old Thread
I looked at the paper work and when the battery got replaced about 10,000 miles ago the ecu was also done. I get the p0420 everyday. Is it the cat or the ecu. If its under 150000 miles is it still under warranty if I am the second owner?
The "found here" link shows the foulers with the stock #42009 found at Autozone. The Insight has three (3) o2 sensors, and this method is used on the 2nd and 3rd sensors ONLY! The P0420 is from the 2nd o2, while the P1420 is from the 3rd sensor.
The 1st sensor is used for your air-fuel ratio, no messing around with that one.
Here is another thread that even has a link for making a wiring-bypass simulator Old Thread
Yeah, I was getting P0420, so I put the anti-foulers one the 2nd O2 sensor and then it turned into a P1420, because the 3rd O2 has not been anti-fouled yet. When I become less lazy I will put anti-foulers on the 3rd O2 and will report back to the forum with results, it will hopefully remove the P1420 for good.
__________________ 2002 Red Honda Insect 5MT
Detriments: 270,000 miles, P1447+P1449 IMA failure (bad battery), P1420 catalyst failure
Mollifying modifications: Scangauge, 70% condensor blockoff, OEM tires at (more than 50)psi, clutch bypass switch
Stats: 51 lifetime MPG when purchased late 2011; 52.1 lifetime MPG current.
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p0420
