P0420 - GenericTypePowertrain - Auxiliary Emission Controls - ISO/SAE Controlled Description Catalyst System Efficiency Below Threshold LocationBank 1

Elm 327 and torque app for Android generated this error when my engine lights came on.

Thanks!

 

Do you have a decat system? I had this, I think its from the rear sensor in the second cat/decat, and it happened when I was on a run, but not booting it funnily enough. It doesn't come back now I have had a remap.

 

yep, decatted,to be honest, ive been getting my mpg up for works trips and i can get 300 miles to a tank (328hp 370lbs) by driving like a nun with 9 points on the license.

Dont think the car likes to be driven "softly"

Ive reset the lights using the torque app and will drive a bit more lively and see if it comes back on.

 

if the car isnt mapped for the decat it will keep coming back

 

You could try giving it a quick blast with a little bit of high-ish reving, clear the fault code and then see if it returns.

 

p0420 is catalyst below threshold. usually deleted when the cars being mapped

 

ah right. perhaps clinic didnt delete it (its fully decat). Ive noticed i still have a speed limit attached to the car too (dont ask, im not criminating myself lol)

 

daft question but have you had the car mapped ?

or just de-catted..

Shaun

 

Carl's car is mapped before anyone else asks the question

 

I wonder why the mapper didn't "map out" P0420 then ?

Shaun

 

Mapper probably missed turning it off.

Give them a call and take back etc.

Simon

 

Yup rear cat O2 sensor not showing enough of a difference from front O2 sensor.

Driving slow makes it come on quicker. As the cat test logic only fires at steady speed.

1. get it mapped out. easiest option.


2. get the rear sensor placed further out of the stream. a simple 8-10 cm tube added onto the current sensor bung in the downpipe. Any xhaust shop should be able to fab one up.


3. or move the sensor to the furthest location on the decat exhaust.