Lambda sensor cheat

Sigster100 · Post by **Sigster100** » Tue Oct 28, 2014 6:22 pm

Hello. Have just had a decat pipe fitted and the engine management light is now on permanently. Have been told that I need to get a Lambda sensor cheat. Anyone know where I can get one from please?
Cheers
Brad

Peter Gidden · Post by **Peter Gidden** » Tue Oct 28, 2014 6:24 pm

WTF is a "lambda sensor cheat"? Who told you that?

Your lambda sensor should be attached to your decat in the same location as the original dp elbow. Everything should work as it did before.

What fault code have you got?

shinny · Post by **shinny** » Tue Oct 28, 2014 6:32 pm

I'm assuming you have a turbo, as a decat on an NA shouldn't affect the lambda sensor.

The lambda sensor is a pretty important sensor on your car. No one deletes their lambda sensor as there's absolutely no benefit to it. Occasionally people replace the lambda sensor with a wideband sensor and use the wideband controller's emulation to "fake" the lambda, but I doubt that's the situation you're in.

If your decat doesn't have a bung for the lambda, throw it away and fit something that's actually built for the car!

2mad · Post by **2mad** » Tue Oct 28, 2014 6:47 pm

Sigster100 wrote:Lambda sensor cheat.
Brad

Pretty important sensor mate , dont know of any cheat

What error code do you have .

slipping clutch · Post by **slipping clutch** » Tue Oct 28, 2014 6:56 pm

Are you sure its the lambda sensor and not the cat overheat sensor you are referring too? I can't see your car running for long without the lambda sensor but it will run without the cat sensor in ( cat sensor is in the lower part of the downpipe )

Mullen · Post by **Mullen** » Tue Oct 28, 2014 7:36 pm

If it helps at all...

Sigster100 · Post by **Sigster100** » Tue Oct 28, 2014 7:38 pm

Thanks for your replies fellas. Yes I do have a turbo and it was the garage that fitted the decat that told me what I had to get. I have no idea what one is and so just thought I would ask you experts. Time to go back to him I guess and tell him to get one for me and fit it!!
Cheers

Peter Gidden · Post by **Peter Gidden** » Tue Oct 28, 2014 7:38 pm

Mullen wrote:If it helps at all...

OP's other threads refer to a Rev2 Turbo.

Sigster100 · Post by **Sigster100** » Tue Oct 28, 2014 7:41 pm

Thanks Peter. Nice pic but does not help me I am afraid. I will give the problem back to him to sort out. First things first though is the boost upgrade, new ICE installation and full respray!! Overdraft here we come!!

Mullen · Post by **Mullen** » Tue Oct 28, 2014 7:41 pm

Peter Gidden - SBITS wrote:
Mullen wrote:If it helps at all...

Image Replaced With URL For Quote http://i.imgur.com/eg2i1W6.jpg

OP's other threads refer to a Rev2 Turbo.

Fair enough, just happen to have it all out on the floor currently and figured the cat sensor would likely be the same.

Sigster100 · Post by **Sigster100** » Tue Oct 28, 2014 7:44 pm

I appreciate your help Peter but the technical stuff baffles me...I just stick to spending money on the car and let others do their stuff!

2mad · Post by **2mad** » Tue Oct 28, 2014 7:48 pm

Just need to know your error code ... and we could really help you

Sigster100 · Post by **Sigster100** » Tue Oct 28, 2014 7:53 pm

Ok. Will take it back to him in near future and get the error code. Thanks all.
Having lots done to it so big project...guess I will learn as I go along. Pics to be posted once it is back to its former glory

bobhatton · Post by **bobhatton** » Tue Oct 28, 2014 11:18 pm

Sigster100 wrote:Ok. Will take it back to him in near future and get the error code. Thanks all.
Having lots done to it so big project...guess I will learn as I go along. Pics to be posted once it is back to its former glory

If I was you i would take it to someone that knows what he is doing, your chap has not got a clue and will only do damage by the sound of what he is saying

shinny · Post by **shinny** » Wed Oct 29, 2014 2:20 am

bobhatton wrote:
Sigster100 wrote:Ok. Will take it back to him in near future and get the error code. Thanks all.
Having lots done to it so big project...guess I will learn as I go along. Pics to be posted once it is back to its former glory

If I was you i would take it to someone that knows what he is doing, your chap has not got a clue and will only do damage by the sound of what he is saying

This!

I learnt the hard way that taking it back to someone who mucked it up the first time (even though they are supposed to be MR2 specialists!) just meant they screwed things up the second and third times too, while "fixing" their original howler.

kev8611 · Post by **kev8611** » Wed Oct 29, 2014 1:05 pm

I agree with the others. Surely the decat doesnt affect the readings as the sensor is placed just after the turbo and before cat?

I know on one of my previous cars when I decatted it I removed the second sensor after the cat but no way I would remove the main one.

shinny · Post by **shinny** » Wed Oct 29, 2014 1:15 pm

kev8611 wrote:I agree with the others. Surely the decat doesnt affect the readings as the sensor is placed just after the turbo and before cat?

I know on one of my previous cars when I decatted it I removed the second sensor after the cat but no way I would remove the main one.

On a turbo, the decat pipe generally replaces the turbo elbow that contains the hole for the lambda sensor. I've never seen a turbo decat pipe without a flange for the sensor, but it sounds like the OP found one!

The second sensor is the cat temperature sensor and can safely be disconnected without any effect.

jimGTS · Post by **jimGTS** » Wed Oct 29, 2014 11:38 pm

First of all, what 'exactly' did you supply this place to fit?
Picture/link??

All downpipes for the turbo come with a O2 sensor bung (to fit the sensor). There is no reason AT ALL why this shouldn't just be bolted into the new downpipe when it's removed from the original downpipe.

There is no such thing a lambda/O2 delete.

I suggest you read up about the downpipe, find some pictures online and learn what it is the garage is fitting and understand why the O2 is still needed and try and work out why the hell the garage says you don't need it anymore!

The only sensor that is ditched when fitting a downpipe to a turbo is the cat temp sensor (purely because aftermarket downpipes don't come with the bung for it not to mention the sensor is ni on impossible to remove from the cat). It can simply be unplugged.

Super_red · Post by **Super_red** » Tue Nov 04, 2014 10:09 pm

Lambda 'cheat' is for cars with a pre and post cat lambda. The pre cat lambda does the important stuff the post cat just makes sure the cats working and flags up a light if its not. When you fit a decat you have to make sure the 2 lambdas read differently to avoid the malfunction light coming on. This can be done electronically or by fitting a spark plug extension (de fouler I think) to the second cat.

Neither of these apply to any version of the MR2 and both require the Lambda to still be fitted in the exhaust to work.

Peter Gidden · Post by **Peter Gidden** » Tue Nov 04, 2014 10:17 pm

I bet the knowledgeable master mechanic at the local spanner pit thought the cat temp sensor was a post cat 02 sensor, and therefore needed a "cheat".

Shame aforementioned knowledgeable master mechanic didn't notice cat temp sensor has 2 wires, and 02 sensors are either 1,4 or 5 wire sensors.

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