Engine light - P0420

[EthanMenace]

So whilst going down the motorway I had an amber engine light pop up, I chucked in a cheap code reader which came up with the below:

Am I right in thinking this is a Lamda sensor?
I've got a sports cat but that's been on the car a good few months now so I assume its a sensor that's gone?

Can anyone help me out on this?

 

[colesy]

P0420 is cat efficiency which usually indicates a failing catalytic converter

 

[woot woot]

I get this code also, i had the rear O2 sensor replaced, and it came back, my mech thiks it might be a broken circuit as the CAT still looked good

 

[EthanMenace]

P0420 is cat efficiency which usually indicates a failing catalytic converter

I’d be surprised if that was the case as it’s only a couple of months old

 

[EthanMenace]

I get this code also, i had the rear O2 sensor replaced, and it came back, my mech thiks it might be a broken circuit as the CAT still looked good

I might just try replacing the sensor then and go from there, did you go for genuine?

 

[MRBILLYUK]

I might just try replacing the sensor then and go from there, did you go for genuine?

Genuine Bosch lambda sensor. Buy cheap, buy twice.
https://www.ebay.co.uk/itm/30344154...rentrq:f282edba17e0ab8c96d48025fffbafa8|iid:1

 

[Brigsy]

Sports cat might chuck the eml on. Clear the code and monitor

 

[EthanMenace]

Genuine Bosch lambda sensor. Buy cheap, buy twice.
https://www.ebay.co.uk/itm/303441549650?_trkparms=amclksrc=ITM&aid=111001&algo=REC.SEED&ao=1&asc=20160908105057&meid=ff17a4b3ac99499f83006a4bff3a855d&pid=100675&rk=1&rkt=15&sd=303441549650&itm=303441549650&pmt=0&noa=1&pg=2380057&brand=Bosch&_trksid=p2380057.c100675.m4236&_trkparms=pageci:2df46a08-8cb3-11ec-86bb-be2590e225d9|parentrq:f282edba17e0ab8c96d48025fffbafa8|iid:1

Cheers, was looking at genuine Renault ones which were up for £140

 

[EthanMenace]

Sports cat might chuck the eml on. Clear the code and monitor

I’ve tried resetting it once and it came straight back, for the sake of £50 I’ll probably chuck a new sensor in and keep an eye on it, cheers

 

[MRBILLYUK]

Cheers, was looking at genuine Renault ones which were up for £140

Genuine Renault are Bosch 😉

 

[EthanMenace]

Genuine Renault are Bosch 😉

The more you know 😃

 

[VenomUK]

The more you know 😃

May also be worth checking euro car parts as they also stock bosh lambda or in fact most motor factors will stock bosh. If one has a deal on over a weekend that brings the price down then happy days.

 

[MRBILLYUK]

May also be worth checking euro car parts as they also stock bosh lambda or in fact most motor factors will stock bosh. If one has a deal on over a weekend that brings the price down then happy days.

£119.99 at ECP 😮 That's with their discount code. Normally they're pretty competitive, but not this time lol.
I don't think you'll find much cheaper than the one I posted a link too. And it's definitely genuine. I've been running one for about 5 months now. 😊