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 Posted: Thu Sep 15, 2011 4:44 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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i have pluged my car in to a diagnostic plug and p0420 came up. Catalyst System Efficiency Below Threshold (Bank 1). i no my car had a new cat back in january. so could it be a possible lamda sensor problem?
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| if it dont scuff the ruff it aint low enuf | |
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Posted: Thu Sep 15, 2011 4:47 am |
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Joined: Feb 10, 2010
Posts: 4014
Trade Rating: +2
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Lamba sensor would be my guess.
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Posted: Thu Sep 15, 2011 4:50 am |
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Joined: Nov 27, 2010
Posts: 11520
Trade Rating: +10
Location: What's it to you? ? ?
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Is this a new or stored fault code?
Diagnosed correctly when the cat was replaced or was it just the normal parts thrown at it till its fixed routine?
Genuine cat fitted?
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Posted: Thu Sep 15, 2011 4:50 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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which 1? top or bottom sensor
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| if it dont scuff the ruff it aint low enuf | |
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Posted: Thu Sep 15, 2011 4:54 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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the cat was replaced back in january before i purchased the car. the engine managment light came on sunday just gone so new. unsure if the cat is genuine.
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| if it dont scuff the ruff it aint low enuf | |
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Posted: Thu Sep 15, 2011 5:09 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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P0420 means ECU has spotted that the post cat O2 sensor signal is following too closely the signal from the pre cat O2 sensor so logically it believes the cat isn't doing very much so it fires up a cat efficiency warning. It doesn't mean there is anything wrong with O2 sensors
At steady rpm the pre cat signal should be oscillating and post cat fairly steady so looking at the graph output of both of them would be the first step
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Last edited by Deckchair5 on Thu Sep 15, 2011 5:18 am; edited 1 time in total
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Posted: Thu Sep 15, 2011 5:10 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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ok i will give that ago. is there any bits of software you would recommend? i have a usb obd11 reader
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| if it dont scuff the ruff it aint low enuf | |
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Posted: Thu Sep 15, 2011 5:20 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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If your car is EOBD then there's a bucket load of software available. Ideally you want something with a graphical output so you can compare the two, you can still see what's going on though with the raw figures
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Posted: Thu Sep 15, 2011 5:48 am |
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Joined: Nov 27, 2010
Posts: 11520
Trade Rating: +10
Location: What's it to you? ? ?
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Whats the betting its a cheap / s**te non genuine cat thats been fitted 
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Posted: Thu Sep 15, 2011 5:56 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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just going through the paper work and the cat was £230 . so not that cheap  and ive been using easy obd2 software but it keeps coming back with vehicle trouble code not available
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| if it dont scuff the ruff it aint low enuf | |
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Posted: Thu Sep 15, 2011 6:05 am |
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Joined: Jun 19, 2010
Posts: 1600
Trade Rating: +4
Location: South Bucks
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What is the year of your car? Petrol post sept 2001?
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Thu Sep 15, 2011 7:33 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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petrol 1.1 2003
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| if it dont scuff the ruff it aint low enuf | |
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Posted: Thu Sep 15, 2011 7:33 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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petrol 1.1 2003
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| if it dont scuff the ruff it aint low enuf | |
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Posted: Thu Sep 15, 2011 7:59 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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That'll be EOBD2 then so you're fine
Here's Gendan software and some good looking O2 sensors on tickover
but if the bottom trace was similar to the top one then that shows the cat isn't doing its stuff
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Posted: Sun Oct 16, 2011 11:59 am |
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Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth
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thought i would bring back up n old topic. this code came up today  have worked out its every 3 weeks it seems 2 pop up . ive changed the panel filter back to standard n replaced the ngk plugs for bosch super 4s to see what happens.
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| if it dont scuff the ruff it aint low enuf | |
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