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 Posted: Sun Apr 01, 2018 12:01 pm |
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Joined: Apr 15, 2012
Posts: 23
Trade Rating: 0
Location: uk
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2003 Peugeot 206 (multiplexed) 1.4 8 valve
Hi, anyone know what the resistance should be (in ohms) for the heater element in the pre and post cat lambda sensors?
Bill
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Posted: Sun Apr 01, 2018 9:58 pm |
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Joined: Jun 19, 2010
Posts: 1599
Trade Rating: +4
Location: South Bucks
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If Bosch I think they are all 4 ohms
But the cable lengths differ and this may be part of tge equation ... it's been a very long time since my Physics O-level! But for most cars the existing sensor can be replaced by an LS615 ...
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Mon Apr 02, 2018 6:10 am |
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Joined: Apr 15, 2012
Posts: 23
Trade Rating: 0
Location: uk
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Hi Gazza82,
Thanks for the reply, I think you are absolutely right which confirms my own opinion.
I've had a continuing problem for awhile now. started two months ago with the engine light on, Peugeot planet said it was the upstream lambda sensor, checked it and the heater part of the sensor was open so replaced it. Ok for six weeks then an occasional misfire on idle and an occasional momentary loss of power (engine light not on). Peugeot planet said it was an intermittent upstream lambda sensor (short to +), since this was a new sensor I cleaned the connector carefully and refitted it but made no difference. Measured the heater resistance (across the two white wires) which was 11.3 ohms, also did the same with the downstream sensor which was 5.2 ohms. Ordered both sensors which seemed like a good idea. New sensors arrived, they both have a heater resistance of 4.8 ohms, aside from the cable length etc they both seem to be identical and have the same production code stamped into them. There is mention on the internet that the pre and post cat sensors have quite different characteristics and different heater resistance. I don't think that's correct.
Like yourself its a very very long time since my Physics O-level!
Bill
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Posted: Mon Apr 02, 2018 6:07 pm |
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Joined: Jun 19, 2010
Posts: 1599
Trade Rating: +4
Location: South Bucks
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I had an NTK lambda fitted to my Alfa 156 ... and forever had errors logged. Turns out NTK lambdas don't have the correct ohm rating ... swapped out the lambda with an LS615 Universal (no soldering!) and fault codes stopped. MPG improved too!
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Tue Apr 03, 2018 5:50 am |
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Joined: Apr 15, 2012
Posts: 23
Trade Rating: 0
Location: uk
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Fitted both sensors yesterday, so far so good.
Thanks gazza82
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Posted: Thu Apr 05, 2018 7:40 am |
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Joined: Apr 15, 2012
Posts: 23
Trade Rating: 0
Location: uk
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This is becoming silly. lasted a short time then engine light on, peugeot planet says permanent fault upstream oxygen sensor (short to +). There has been no idle problems or rough running. Until the original sensor failed everything was ok so this has to be a compatibility issue. Everything I have read suggests that the signal output of most 4 wire lambda sensors is virtually identical but the heater resistance can be between 4 and 20 ohms, so I'm back to my original question. Does anyone know what the resistance should be (in ohms) for the heater element in these peugeot sensors? Failing all else I suppose I'll have to buy an original puegeot part.
Bill
Added as an edit:- Checked the voltage on the heaters of both lambda sensors, post cat 12v constant pre cat pulsing rapidly off and on is this normal?
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Posted: Mon Apr 16, 2018 6:05 am |
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Joined: Apr 15, 2012
Posts: 23
Trade Rating: 0
Location: uk
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This problem is now fixed.
After changing the upstream lambda sensor twice I was getting nowhere.
The original failed part was NTK 9636968780 eventually I sourced this exact same part and it works perfectly!
Bill
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