Lambda and O2 Sensor Question!

Kayble · 07-10-2010, 01:13 PM

Hey, it was my understanding that they are the same thing, but when looking for a decat manifold i came across one that said it had 2 holes cut for the Lambda and O2 sensors.

Its a Mk1 focus, so is there more than one, and where are they located, or is there just one, and where is it?

Thanks

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chaffe · 07-10-2010, 01:21 PM

some systems use two sensors to measure the cat efficeintcy, not sure if your car has this system. but lambda and o2 sensors are the same thing mate

Kayble · 07-10-2010, 01:22 PM

k thanks, i thought that, just wanted to check, i take it if mine only uses one then i can just block off the extra hole on the manifold?

chaffe · 07-10-2010, 01:24 PM

Quote:

Originally Posted by Kayble

k thanks, i thought that, just wanted to check, i take it if mine only uses one then i can just block off the extra hole on the manifold?

Yeah mate, or use it for a wideband gauge for tuning

martysmartie · 07-10-2010, 01:57 PM

As said some have two they are usually referred to as pre and post cat, and I seem to remember the Focus does have two.

Martin

tabetha · 07-10-2010, 04:10 PM

A 02 sensor is just that it measures 02, or rather oxygen content in the exhaust gasses, this sensor is usually termed lambda sensor by most but 02 sensor is more correct.
Lambda is signal(voltage) that it generates, a certain voltage is a certain lambda value, lambda 1 is the chemically correct ratio, called stoichiometric roughly 14.7:1, 14.7 parts of air to 1 part fuel, the ratio is actually a tad under but 14.7:1 good enough, 0.8 0.9 etc are comparisons to the chemically correct ratio.
tabetha

chaffe · 07-10-2010, 06:11 PM

as i said they are the same thing

boyblew · 07-10-2010, 06:58 PM

hi do eany one have the p0172 on a st

170

07-10-2010, 01:21 PM	#2
chaffe Turbocharging Technician Garage is empty, add now Trader Score: (0) Join Date: Jul 2010 Location: Top secret. Mission:Imposible. Posts: 3,558 Rep Power: 6	some systems use two sensors to measure the cat efficeintcy, not sure if your car has this system. but lambda and o2 sensors are the same thing mate __________________

07-10-2010, 06:11 PM	#7
chaffe Turbocharging Technician Garage is empty, add now Trader Score: (0) Join Date: Jul 2010 Location: Top secret. Mission:Imposible. Posts: 3,558 Rep Power: 6	as i said they are the same thing __________________

07-10-2010, 06:58 PM	#8
boyblew Virgin Garage is empty, add now Trader Score: (0) Join Date: Oct 2010 Location: essex Posts: 1 Rep Power: 0	hi do eany one have the p0172 on a st170

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07-10-2010, 01:22 PM	#3
Kayble 15000 Garage is empty, add now Trader Score: (0) Join Date: Aug 2010 Posts: 42 Rep Power: 0	k thanks, i thought that, just wanted to check, i take it if mine only uses one then i can just block off the extra hole on the manifold?

07-10-2010, 01:57 PM	#5
martysmartie PassionFord Post Whore!! Garage is empty, add now Trader Score: (1) Join Date: Dec 2007 Posts: 6,717 Rep Power: 13	As said some have two they are usually referred to as pre and post cat, and I seem to remember the Focus does have two. Martin

07-10-2010, 04:10 PM	#6
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,621 Rep Power: 0	A 02 sensor is just that it measures 02, or rather oxygen content in the exhaust gasses, this sensor is usually termed lambda sensor by most but 02 sensor is more correct. Lambda is signal(voltage) that it generates, a certain voltage is a certain lambda value, lambda 1 is the chemically correct ratio, called stoichiometric roughly 14.7:1, 14.7 parts of air to 1 part fuel, the ratio is actually a tad under but 14.7:1 good enough, 0.8 0.9 etc are comparisons to the chemically correct ratio. tabetha

07-10-2010, 06:58 PM
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