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 Posted: Sat Feb 26, 2011 3:28 pm |
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Joined: Jun 13, 2010
Posts: 44
Trade Rating: 0
Location: Sibiu, RO
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Hello guys,
I have a 2001 206 1.6 16v. My engine light came on a few months ago. At first I went to a friend of mine and had the fault code read. We’ve had it deleted at first but after 200 km the light came on again.
The code was:
Catalyst System Efficiency Below Threshold
P0420
Sensor 1 0700- 2.3% (3,9)
Sensor 2 0465- 99,2%
Since then we’ve deleted it several times, but the fault returned, not straight away but even sooner than first time. I checked all the pipes from exhaust, catalytic converter, manifold for leaks and I didn’t find anything; checked the spark plugs (bought 4 months ago), checked the wires of the 2 lambda sensors from the cat. Not experiencing any loss of power or an increase of fuel consumption.
I thought I’ll give it a try and post it here before I’ll have to buy anything.
Thanks.
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Last edited by shoaky on Thu Mar 03, 2011 11:22 am; edited 1 time in total
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Posted: Sat Feb 26, 2011 4:39 pm |
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Joined: Jan 22, 2011
Posts: 100
Trade Rating: 0
Location: Earth, most of the time!!
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From what you say, i would suspect the cat to be faulty. It has more than likely failed internally so no obvious way of telling visually.
Maybe worth checking emissions to see whats going on exactly regarding exhaust gases, this will tell you alot about whats going on 
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| If in doubt, drop a cog and put your foot down | |
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Posted: Mon Feb 28, 2011 2:57 am |
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Joined: Jun 13, 2010
Posts: 44
Trade Rating: 0
Location: Sibiu, RO
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I should go for an emissions check then... but if the numbers are different on the check, could it be a situation in which one of the senors reading is wrong and it determines the cat to work different??
thank you and for any other ideas feel free to write.
thanks.
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Posted: Mon Feb 28, 2011 3:21 am |
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Joined: Feb 07, 2010
Posts: 5120
Trade Rating: +19
Location: Raunds, Northamptonshire
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Does that mean above sensor 1 is reading poor emissions ???
If so is number one before or after the cat?
Also It's not uncommon for a lambda sensor to fail.
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Posted: Mon Feb 28, 2011 3:35 am |
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Joined: Jun 13, 2010
Posts: 44
Trade Rating: 0
Location: Sibiu, RO
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sensor 1 is above the cat. as for the reading of the emissions of the first sensor, I did not payed much attention at first. I'll do a scan again and check the values.
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Posted: Thu Mar 03, 2011 11:21 am |
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Joined: Jun 13, 2010
Posts: 44
Trade Rating: 0
Location: Sibiu, RO
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here's a print on the two sensors while the engine is running.
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Posted: Wed Jul 13, 2011 3:13 pm |
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Joined: Jun 19, 2010
Posts: 1600
Trade Rating: +4
Location: South Bucks
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I think sensor 2 is dead ... it should fluctuate as the internal heater switches on and off ...
Lambdas are a bit like spark plugs .. they have a life of about 60,000 miles. Also some of the cheaper non-original Lambda's are incorrect and they continuously record fault codes ... if it had a Bosch originally, fit another Bosch!
A lot of lambdas were destroyed in the UK when the petrol was contaminated ... can't remember which make but I think it was a supermarket.
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Fri Jul 15, 2011 3:45 am |
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Joined: Jun 13, 2010
Posts: 44
Trade Rating: 0
Location: Sibiu, RO
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interesting is that recently the fault code disappeared for 300 km and then came up again.
I will go have emissions checked and then read the code to pay a little more attention on sensor2.
thanks gazza82.
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