So I went and got a OBD2 scantool and have erased the CEL. But of course every few days it comes back up again and I've got to erase it.
I need a permanent solution for this. I'm not sure if it's a TODA fault (read previous few pages) or an installation issue. So who should I go to cos I REALLY want this fixed.
Have you tried asking the Hondata guys they seem to be doing amazing things with the JTune products and ECUs I’m sure they have come across the problem before.
It was P0420 Catalyst Efficiency Below Threshold (Bank 1)
It's not Toda's nor Revzone's fault. This code is common with highflow cats. What you need is an O2 sensor defouler. It's basically an extension to get the O2 sensor out of the stream of the exhaust gas. While it could mess a bit with closed loop mode, it'll stop the CEL code from coming back.
I know of this solution but I also know that there are people out there with Toda hi-flow cats that don't have this problem. And with the mess-ups with my installation (read previous pages) I'm wondering if it's because of the missing gasket or the installation that caused it.
I know of this solution but I also know that there are people out there with Toda hi-flow cats that don't have this problem. And with the mess-ups with my installation (read previous pages) I'm wondering if it's because of the missing gasket or the installation that caused it.
I don't think a leak would cause your O2 sensor to read richer than it actually was. It depends on how rich your car is setup to run. If your ECU is stock and doesn't have tuned fuel maps, of course it would run rich. The high flow cat would be the straw that breaks the camel's back.
You get this error code when the O2 sensor voltage is out of what has been preset as "normal". Honda might have changed O2 sensor part numbers or changed the range of O2 sensor voltages that the ECU deemed normal, thus making Euros of other years less susceptible to this code.
I realise that the defoulers will solve the problem P0421, but will it solve P0420 too?
You're meant to use the defouler on the 2nd O2 sensor to fix the P0420 code (running too rich). P0421 means "Warmup Catalyst Efficiency Below Normal", which is probably the 1st sensor reading rich, while the 2nd sensor is reading normal, since the Euro has only 1 cat and doesn't have a pre-cat.
Was checking other forums and they got P0421 when they had cracks in their headers (no pre-cat). So P0420 is good when compared to P0421
Originally Posted by E-Gene
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