#1: How-to test a lambda sensor? (Not just a fault code reader . Author: gazza82, Location: South BucksPosted: Mon Oct 10, 2011 9:09 am ---- How do you test a lambda sensor with a multi-meter and what am I looking for on a dual-lambda exhaust system (2.0i 16v)
thanks in advance!!
#2: Re: How-to test a lambda sensor? (Not just a fault code reader . Author: Lee, Location: EnglandPosted: Mon Oct 10, 2011 9:24 am ---- 4-5 ohms on pins one and two on lambda
#3: Re: How-to test a lambda sensor? (Not just a fault code reader . Author: hs8bb, Location: MaidstonePosted: Sat Oct 22, 2011 2:35 am ---- Hello,
Lee, is it right that the Voltage should be that high for the after cat sensor? Only asking as I thought that meant a rich mixture, so would have expected a low voltage reading compared to the pre cat sensor.
Cheers
#4: Re: How-to test a lambda sensor? (Not just a fault code read Author: Deckchair5, Location: Bath UKPosted: Sat Oct 22, 2011 3:34 am ---- On tickover with a warm engine then the O2 sensors should look like this. Pre cat oscillating around every second and post cat fairly stable
If the pre cat sensor showed consistently high voltage then it might well mean an over rich condition (or an exhaust leak) but with the post cat sensor then it's simply saying "lots of oxygen here after the cat" The cat converts oxides of nitrogen (NOx) to produce carbon dioxide(CO2), nitrogen(N2), and water(H2O) so lots of oxygen there
#5: Re: How-to test a lambda sensor? (Not just a fault code read Author: hs8bb, Location: MaidstonePosted: Mon Oct 24, 2011 12:57 am ---- Many thanks for that! Seems to be exactly what mine is looking like, mine is maybe a touch higher Voltage in the pre CAT sensor but still oscillating as it should.
Hope it will go through the MOT now!
Bugger, just realised you said at tick over, what should it look like at high idle?
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