Engine code [will it pass nct?]

peter bermingham

2000 1.4 Honda civic through up code p0420 cat oxygen sensor. My question is will the car get through the nct its up next week. Thanks

martinr5232

Chances are your emissions will be all over the place with the sensor faulty.

biko

You can chance it with nct if there are lights on the dash.

peter bermingham

I have the light switched off but for the sake of it might get a sensor

nd

I've had that code on my car for over a year(since I bought it) and it passed the nct recently.

Atlantic Dawn

Have a listen under the car to see if there's a hole in the exhaust, sometimes this can be the cause rather than the sensor itself. If there is could be patched up to pass.

dieselbug

peter bermingham wrote: »

I have the light switched off but for the sake of it might get a sensor

Dont blame the sensor because you dont like what it's telling you.

Chances are it needs a new cat and the sensor is just reporting the condition it sees.

Better to spend the money on a bit of testing.

nd

Imo send it for the nct. If it fails emissions miserably you need a new cat. If it doesn't disregard that code.

Stoolbend

Is p0420 not catalyst efficiency below threshold. If so it could be the cat that's going.

It doesn't necessarily mean your emissions will be bad though.

joujoujou

peter bermingham

Thanks all ya its blowing a small bit have done 100 or so miles since i switched it of going to run it through the nct then up for sale this civic has broke me heart must have got a dud as normal their fairly good auld car

case_sensitive

I've had P0420 on my Puma for the better part of a year now; I replaced my NCT-failure CAT with an aftermarket (cheap) one 2 years ago, and it looks like it's 'used up'. I replaced the lambda (post cat O2) sensor, but it's not the sensor, its the CAT not impacting the exhaust gases enough.

My Ultragauge clears the Check Engine Light, which I'd say pops up about once a month. It got through the NCT with the issue (though not the light) last year, but only by the skin of its teeth (0.1ppm off) and I'll put it through this year, but I expect to have to bring it back with a shiny new Ford-OE spec cat a couple of weeks later.

If you can, borrow a known-good sensor, they're pricey enough if there's nothing wrong with yours.

peter bermingham

case_sensitive wrote: »

I've had P0420 on my Puma for the better part of a year now; I replaced my NCT-failure CAT with an aftermarket (cheap) one 2 years ago, and it looks like it's 'used up'. I replaced the lambda (post cat O2) sensor, but it's not the sensor, its the CAT not impacting the exhaust gases enough.

My Ultragauge clears the Check Engine Light, which I'd say pops up about once a month. It got through the NCT with the issue (though not the light) last year, but only by the skin of its teeth (0.1ppm off) and I'll put it through this year, but I expect to have to bring it back with a shiny new Ford-OE spec cat a couple of weeks later.

If you can, borrow a known-good sensor, they're pricey enough if there's nothing wrong with yours.

Thanks ya their around €140 test is Wednesday so i am going to chance it and see

case_sensitive

peter bermingham wrote: »

Thanks ya their around €140 test is Wednesday so i am going to chance it and see

Yikes :eek:
I paid £56 for mine.

ofcork

I had that code on my previous avensis over 3 years and it passed 2 ncts without a bother,it seems that code is difficult to actually find the problem.