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Author Topic: Catalyst System Error  (Read 11328 times)

Offline pandahouse68

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Re: Catalyst System Error
« Reply #15 on: June 10, 2012, 08:31:50 pm »
I reckon Lambda sensor and Oxygen senor are the same things  :laugh:

and I have the same fault code P0420 too :pomppomp:

Is yours a perminant fault code or intermittent? Do you get any warning lights? Mine doesn't?

yes ,warning light on and a running a stock exhaust system also just passed both the MOT emission test
and VCDS readiness test.
http://www.ross-tech.com/vcds/tour/readiness.html
and I believe there's nothing wrong with CAT or two Lambda sensors.

Offline xxx_mojo_xxx

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Re: Catalyst System Error
« Reply #16 on: June 10, 2012, 10:26:32 pm »
I think I'm going to replace my coil packs in the first instance to see if that improves matters.

My car has done close to 75k, and they may be one on the way out.  I suspect unburnt fuel caused by poor ignition sparks may cause this.

Saintsteve

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Re: Catalyst System Error
« Reply #17 on: June 11, 2012, 07:10:26 am »
I think I'm going to replace my coil packs in the first instance to see if that improves matters.

My car has done close to 75k, and they may be one on the way out.  I suspect unburnt fuel caused by poor ignition sparks may cause this.


Let us know how u get on. mine were changed as part of the recall about a year ago. No miss-fires  logged but could be a possibility.  :happy2:

Offline pandahouse68

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Re: Catalyst System Error
« Reply #18 on: June 11, 2012, 09:30:22 am »
yeah, please keep updated :P

Offline xxx_mojo_xxx

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Re: Catalyst System Error
« Reply #19 on: June 11, 2012, 09:50:30 am »
yeah, please keep updated :P
Will do...should have a replacement set in the next couple of days.

Offline xxx_mojo_xxx

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Re: Catalyst System Error
« Reply #20 on: June 17, 2012, 10:13:37 pm »
Replaced spark plugs, coil packs, and petrol filter.  Car appears to be noticeably better and running a lot smoother.

It's too early to say if this has eradicated the issue. Will keep everyone posted.

Offline xxx_mojo_xxx

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Re: Catalyst System Error
« Reply #21 on: July 16, 2012, 09:31:50 am »
Not wanting to tempt fate, but I am glad to report that the issue has been sorted.

Must have been either a faulty spark plug or coil pack.  I'm more inclined to say it was the coil packs.  Car has been driven over 600 miles since the replacement and its running like a dream.  :jumpmove:

Offline Rav2011

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Re: Catalyst System Error
« Reply #22 on: July 24, 2012, 03:23:36 pm »
Hi Mojo,

Please can you tell me if you have a lambda spacer in place (post-cat sensor)?

Has you car been flashed to stage 2?

I get the same problem if I remove my lambda spacer. With the lambda spacer the car complains about the B1 S1 reading too rich?


My coil packs were changed under a recall last year and the spark plugs I changed to Denso's.

« Last Edit: July 24, 2012, 09:16:41 pm by Rav2011 »

Offline xxx_mojo_xxx

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Re: Catalyst System Error
« Reply #23 on: July 26, 2012, 01:01:11 pm »
Hi Rav,

My car has stage 2 remap.  Not sure if my car has a lambda spacer - is there a way I can check? I did have Denso spark plugs originally, the IK24s.  I went back to OEM.

Hope this helps.

Offline Rav2011

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Re: Catalyst System Error
« Reply #24 on: July 26, 2012, 02:03:14 pm »
What OEM plugs you got?

Saintsteve

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Re: Catalyst System Error
« Reply #25 on: July 26, 2012, 07:31:20 pm »
I had NGK 8 plugs after some people were raving about having cooler plugs. I reverted back to Bosch oem 7's and no longer suffer with the same warning error as yourself Rav.
Hth

Offline Rav2011

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Re: Catalyst System Error
« Reply #26 on: July 26, 2012, 07:51:54 pm »
Thanks SaintSteve, now I'll need to find some cheap!

Offline xxx_mojo_xxx

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Re: Catalyst System Error
« Reply #27 on: July 31, 2012, 07:35:58 pm »
What OEM plugs you got?
Standard Bosch ones from the VW dealership.

Offline Rav2011

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Re: Catalyst System Error
« Reply #28 on: August 12, 2012, 12:07:12 am »
Hi Mojo,

The lambda spacer is basically an extension that fits onto the post-cat (after cat) sensor. Lambda spacers can be L-Shaped or a straight fit, some are slightly angled.

It forces the lambda sensor to sit out of the exhaust as opposed to directly in it.

Please can you tell me if you anyone has one of these fitted to the exhaust and has been able to overcome this error?

Dsg steel

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Re: Catalyst System Error
« Reply #29 on: August 12, 2012, 01:12:24 pm »
Had this problem and ounce I fitted the stealth 42 spacer no more engine light