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Author Topic: P0420 fault code  (Read 2769 times)

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Impact Pete

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P0420 fault code
« on: 06 November 2014, 10:35:47 »
Engine light is on and following codes are flashing

P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)

I have a leak between the mid exhaust box and the back box could this effect the above codes?
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Marks DTM Calib

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Re: P0420 fault code
« Reply #1 on: 06 November 2014, 10:38:59 »
Nope, pre-cats are getting tired.

The fix is to relocate the second O2 sensor to behind the main cat
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Impact Pete

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Re: P0420 fault code
« Reply #2 on: 06 November 2014, 10:41:50 »
Quote from: Marks DTM Calib on 06 November 2014, 10:38:59
Nope, pre-cats are getting tired.

The fix is to relocate the second O2 sensor to behind the main cat

ok so just a coincidence then with the leak ive had a few weeks.

re moving sensor will the engine light clear after the set amount of clean starts or will it need clearing?
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Marks DTM Calib

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Re: P0420 fault code
« Reply #3 on: 06 November 2014, 10:52:15 »
It will clear it self

I might be able to spare an hour and fit new bosses for you if needed
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Impact Pete

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Re: P0420 fault code
« Reply #4 on: 06 November 2014, 19:05:10 »
Quote from: Marks DTM Calib on 06 November 2014, 10:52:15
It will clear it self

I might be able to spare an hour and fit new bosses for you if needed

hi very kind will get back to you once I get to have a proper look

thank you
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Impact Pete

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Re: P0420 fault code
« Reply #5 on: 15 November 2014, 14:11:44 »
Quote from: Marks DTM Calib on 06 November 2014, 10:52:15
It will clear it self

I might be able to spare an hour and fit new bosses for you if needed

Thought I would update that the engine light went out a few days later so decided not to do anything!
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VXL V6

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Re: P0420 fault code
« Reply #6 on: 15 November 2014, 14:16:54 »
It'll come back on again more and more!
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chrisgixer

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Re: P0420 fault code
« Reply #7 on: 15 November 2014, 16:52:04 »
Pre cats will get more and more tired as the miles roll by. So the light will stay on for longer and longer periods. Until it's on permenamtly.

Keeping them hot is key, to a point. So lots of pootling in traffic will usually see the light on more often than a motorway journey. And more in turn than ragging the t*ts off it.


What ever you do though, do NOT be tempted to replace the enire cat. See the guide on a permenant fix, muuuuch cheaper. :y
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Impact Pete

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Re: P0420 fault code
« Reply #8 on: 08 May 2015, 20:07:35 »
Quote from: VXL V6 on 15 November 2014, 14:16:54
It'll come back on again more and more!

I thought I would update on this as it's now May and the lights still off and the codes are clear  ::)
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chrisgixer

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Re: P0420 fault code
« Reply #9 on: 08 May 2015, 20:14:13 »
Give it time. :)
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Impact Pete

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Re: P0420 fault code
« Reply #10 on: 08 May 2015, 20:17:11 »
Quote from: chrisgixer on 08 May 2015, 20:14:13
Give it time. :)

6 months is time oh all yee of little faith, this is not the first time an issue has disappeared on my omega without any maintainance!  ;D
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biggriffin

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Re: P0420 fault code
« Reply #11 on: 08 May 2015, 20:40:38 »
Might be worth giving it the shell Italian tune up. :y
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The Sheriff

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Re: P0420 fault code
« Reply #12 on: 08 May 2015, 20:43:01 »
Quote from: Impact Pete on 08 May 2015, 20:07:35
Quote from: VXL V6 on 15 November 2014, 14:16:54
It'll come back on again more and more!

I thought I would update on this as it's now May and the lights still off and the codes are clear  ::)
Bulb's gone. ;D
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05omegav6

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Re: P0420 fault code
« Reply #13 on: 08 May 2015, 21:03:06 »
Quote from: STMO on 08 May 2015, 20:43:01
Quote from: Impact Pete on 08 May 2015, 20:07:35
Quote from: VXL V6 on 15 November 2014, 14:16:54
It'll come back on again more and more!

I thought I would update on this as it's now May and the lights still off and the codes are clear  ::)
Bulb's gone. ;D

Ne'er a truer word said in jest... ::)
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Impact Pete

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Re: P0420 fault code
« Reply #14 on: 08 May 2015, 21:04:59 »
Quote from: Taxi Al on 08 May 2015, 21:03:06
Quote from: STMO on 08 May 2015, 20:43:01
Quote from: Impact Pete on 08 May 2015, 20:07:35
Quote from: VXL V6 on 15 November 2014, 14:16:54
It'll come back on again more and more!

I thought I would update on this as it's now May and the lights still off and the codes are clear  ::)
Bulb's gone. ;D

Ne'er a truer word said in jest... ::)

wouldn't stop codes showing though  :)
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