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18th April 2009, 16:19
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#1
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Frequent Poster
Join Date: Jul 2007
Posts: 810
Car(s): 2001 VTS
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Fault Code 0606
Hi.
Whacked a de-cat on the VTS a few months back and the engine management light popped on the other week. Took it to a garage who plugged in to the ECU and it came up with two faults:
1. Unknown Error (handy!)
2. Fault Code: P0606
Matey cleared them both and the lights gone out now.
Are they the normal codes when the second lambda is disconnected or is that something totaly different? 
Cheers.
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18th April 2009, 17:04
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#2
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Infrequent Poster
Join Date: Mar 2008
Location: porthcawl
Posts: 100
Car(s): white mk1 saxo vts
Black mk1 vtr turbo
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it could be the lambda sensor. but then im sure the sensor is before the cat? my e.m light never came on when i de-catted it best bet mate is to pop into your local citroen garage and ask them to tell you what the code means. they most definatley would know
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18th April 2009, 17:15
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#3
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Saxperience Forum Bum
Join Date: Jun 2008
Posts: 3,932
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Quote:
Originally Posted by scott-richards
it could be the lambda sensor. but then im sure the sensor is before the cat? my e.m light never came on when i de-catted it best bet mate is to pop into your local citroen garage and ask them to tell you what the code means. they most definatley would know
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if the is a fault with the lamba sensors it comes up on the diagnostics machine- lambda sensor fault, or o2 sensor fault. not unknown.
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18th April 2009, 17:19
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#4
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Frequent Poster
Join Date: Jul 2007
Posts: 810
Car(s): 2001 VTS
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Cheers but I have a 2001 model with two Lambda sensors. One before (in the manifold) the cat and one after it. It was the second one that was removed because I de-catted.
Thanks.
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18th April 2009, 17:22
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#5
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Frequent Poster
Join Date: Mar 2008
Location: Sheffield
Posts: 574
Car(s): 98'SaxoVTR
88' R5 GTT
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Is tghe second sensor in a sleeve
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18th April 2009, 17:39
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#6
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Saxperience Forum Bum
Join Date: Jun 2008
Posts: 3,932
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no mate. i have a 2002 vts. it has 2 lamba sensors. putting the second in a sleeve fucks everything up. the second is what is relaying air/fuel mixture cack to the ecu. the first does the temperiture of your CAT.
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18th April 2009, 17:45
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#7
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Frequent Poster
Join Date: Jul 2007
Posts: 810
Car(s): 2001 VTS
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The second one is now in a sleeve yeah.
From what I've read, the second lamda sensor is simply there to check on the efficency of the CAT. So if your CAT is fooked, up pings the warning light. Hence, when you remove the second lambda sensor to fit a de-cat, the ECU picks up something is 'wrong' and smacks on the Engine Management light.
Anyway, does the code 0606 relate to this or do I have another problem. The car runs fine with the light on or off (seems to make no odds) and with the lambda sensor in a sleeve it feels the same but I'm curious as to weather or not that error code is normal.
Cheers.
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18th April 2009, 18:07
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#8
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Saxperience Forum Bum
Join Date: Jun 2008
Posts: 3,932
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thats why your car will be running shit then. i did the same thing with me car and had loads of bother and thats what was up with it. put your sensor back in your exhaust and get the codes cleared off
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18th April 2009, 18:16
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#9
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Saxperience Forum Bum
Join Date: Jan 2008
Location: Down't road from Sheffield
Posts: 4,641
Car(s): Was:16v 106 XS ..... Now: Import 1.8 MX5
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First lamda reads air to fuel, second one detects whether the cat is working. Second lamda is the one that's supposed to be sleeved, so it fools the ECU into thinking the cat is still there and working.
0606 doesn't look good, Google search points to the PCM (Powertrain Control Module....ECU), but if the car's fine now...
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Last edited by titchster; 18th April 2009 at 18:19.
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18th April 2009, 18:29
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#10
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Saxperience Forum Bum
Join Date: Jun 2008
Posts: 3,932
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Quote:
Originally Posted by titchster
First lamda reads air to fuel, second one detects whether the cat is working. Second lamda is the one that's supposed to be sleeved, so it fools the ECU into thinking the cat is still there and working.
0606 doesn't look good, Google search points to the PCM (Powertrain Control Module....ECU), but if the car's fine now...
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i dont even no why i bother trying to help people on here. you tell them whats wrong and they just ignore it.
the sensors are the other way around than what you mentioned. but one sensor checks the temp of the cat the one at the back is the most imporatant one.
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18th April 2009, 18:30
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#11
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Frequent Poster
Join Date: Jun 2005
Location: East Boldon United Kingdom (England)
Posts: 994
Car(s): Clio 172 Cup,Smart 451,Fiat Scudo Van,
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This code often comes up when there is a decat fitted even if it is in a lambda sleeve.
The only time i have ever had this code is when there is no cat on the car, it will be a reacurring fault code but its nothing to worry about.
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18th April 2009, 18:52
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#13
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Frequent Poster
Join Date: Jul 2007
Posts: 810
Car(s): 2001 VTS
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Quote:
Originally Posted by manicmotors
This code often comes up when there is a decat fitted even if it is in a lambda sleeve.
The only time i have ever had this code is when there is no cat on the car, it will be a reacurring fault code but its nothing to worry about.
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Awesome, thanks! Can put my little noggin at rest now.
Gouldy I appreciate the input but I think you've become a bit confused as to what lambda I had removed. Cheers anyway dude.
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18th April 2009, 19:00
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#14
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Saxperience Forum Bum
Join Date: Jun 2008
Posts: 3,932
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you dont need to sleeve any
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18th April 2009, 19:01
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#15
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Saxperience Forum Bum
Join Date: Jun 2008
Posts: 3,932
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Quote:
Originally Posted by Finchowned
Awesome, thanks! Can put my little noggin at rest now.
Gouldy I appreciate the input but I think you've become a bit confused as to what lambda I had removed. Cheers anyway dude.
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hope you get it sorted 
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The Following User Says Thank You to gouldy87 For This Useful Post:
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18th April 2009, 19:11
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#16
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Saxperience Forum Bum
Join Date: Jun 2008
Posts: 3,932
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Quote:
Originally Posted by titchster
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no your alright ill just stick with me being right thanks
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