Thread: Lambda (oxygen) sensor retrofit

My GUESS is that the ECU has all the circuitry and all you have to do is plug in the sensors.

The 14CUX computer has it all so the GEMS one almost certainly will.
HOWEVER you will have to make sure that you fit the correct type of O2 sensor.

14CUX has a Titania sensor not the common zirconia sensor and I think GEMS also has them. Ifit does then they may also have a 12MM nut instead of a 17MM. So don't go drilling holes and welding until you have the sensors in your hot little hands.
there is a UK site which has an application list of sensors vs cars.
OK I did it for you.
See this page and you will see they are Titania.
http://www.lambdapower.co.uk/partsea...'manu=Land Rover
Regards hilip A

Sorry for my ignorance, though what is the advantage of adding the sensors?

Will it give better fuel economy or performance?

I need lambda sensors for my 'Tornado' ECU chipset to function correctly - it requires lambda sensors to adjust fuelling correctly. Without lambdas it runs very rich. Previous owner had installed the Tornado set but fuel economy was very poor. I'd like to keep the Tornado chipset as from all accounts I've read they are brilliant with no downside.

Originally Posted by PhilipA

HOWEVER you will have to make sure that you fit the correct type of O2 sensor.

I'm planning on buying a couple off of eBay - Ritter wanted $250 each and Melb LR wanted $900 each for them.... $111 on eBay new ex UK (which I assume are the right ones)
RANGE ROVER P38 OXYGEN SENSOR 1995>1997 - ERR1834 - eBay, Range Rover, Car Parts, Vehicle Parts Accessories. (end time 24-Jan-10 01:57:12 AEDST)

Mark Adams (the P38 performance chip guru) mentioned something about having a 12mm boss on the exhaust too - so you're bang on there. I think I'll go ahead and order a couple and hope you're correct about the ECU. Worst case is that I have to replace the ECU with one that supports lambdas - 70 pound on british eBay.

A friend of mine fitted a Mark Adams chip - it was designed for use with O2 sensors and his car didn't have them. It seems Adams wasn't aware of sensor-less P38A. He's since replaced the chip with one designed for our cars.

I thought about this a bit more last night, and what probably will be needed is access to a Rovacom or maybe an official dealer machine.

I think there is probably a way to tell the ECU which fuel map to use. In the 14CUX it is a resistor, and I bet that the GEMS will have a check box in the parameters somewhere to change the map.

BTW, AFAIR GEMS ECUs are coded to the particular VIN as a theft prevention measure and also must agree with the speedo. This again will require at least a dealer coding machine. So if you buy one , you will need to spend extra money. I am under the impression that it is very difficult to have a second hand GEMS ECU work in a different car.

Regards Philip A

RPI engineering say to replace a GEMS engine ECU it must be 'unlocked' or 'rechipped' to be usable. By 'unlocked' I assume they mean via Testbook etc ? They go on to say that it will also require a 'security learn' - probably via Testbook etc again. Either way a trip to the stealer sounds like a must.

As for enabling lambda sensors in the ECU - if all that sort of information is contained in the 'chips' then I'm hoping replacing them with my Tornado chipset *should* enable any newly plugged in sensors. I'm hoping that's the case anyways, Tornado is sure looking for lambda input. My current chipset (P38 original) won't just *see* the lambdas I'm sure without at least a bit of encouragement from Testbook

There is a setting in the GEMS ECU to change. It comes up on faultmate

The option in Faultmate have on my 1997 are:
- Not Fitted
- Fitted Pre-Cat
- Fitted Pre and Post Cat

I have to get myself a new Oxy Sensor. Ritters quoted me $450

Stu