jon 928

Hi guys my 95 jap import mot emissions off scale 9.99 ,had new plugs ,it has lambda sensor in rh front header ,and 1 in front pipe ,but only header is connected ,just wondered if both should be connected ?,,any ideas ,could it be that someone has turned fuel up to far ?

Splitpin

Let's get the silly question out of the way first: You do have a catalyst in the exhaust don't you?

jon 928

yes mate it has 2 ,front pipe and center cat

scoobyricht

iTrader: (4)

which sensor is connected, the main one is the downpipe one

jon 928

no just the rh front header ,main down pipe not connected ,carnt find any wires to it ?

VinPlate

It's probably had an after market down pipe fitted, so the one in the down pipe will be the working one.

I had a similar problem, giving 8.27% CO, the oxygen sensor had failed.

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jon 928

many thanks will do that tomm will let you know out come .

The Trooper 1815

iTrader: (31)

Centre pipe is a resonator (silencer/muffler) and not a catalytic converter.

PeeVee

iTrader: (1)

The working sensor on a 95 JDM car should be the one in the RH header! which is why you can't find the wiring for the one in the downpipe...It's not there.

Subaru didn't move the wiring to the downpipe until 1996.

Just a thought.... you say that you have a sensor in the downpipe and you have a cat fitted (your cntr pipe is not a cat as has been stated previously) is the sensor at the top or bottom of the downpipe?

If you have a factory fitted downpipe then the sensor will be at the bottom and it is not a lambda sensor, it is a "cat on fire" sensor which is only fitted to the JDM models & can be disconnected without causing any problems.

Phil

jon 928

Yes mate you are spot on with info ,so do you think if i fit a new lamda sensor in the rh header it should be ok ,i have been trying to find out today that ,uk cars run a 12 volt lamda ,and some jap imports run 5 volt lamda ? dont know how true this is ,have spoken to subaru parts today ,they were contacting factory to see what to do ,he mentioned that like you say 1 is a lamda ,and 1 a oxy ,or cat on fire sensor ,i removed exhaust to day its got a original front pipe with sensor in the center of the cat ,that bits ok not connected ,but there is a second cat in the center of the car honey comb center and very heavy ,and the hangers dont match the car ,have checked the part no of this and its off a 2005 scooby ,so thats not right ,so have put front pipe std cat back on ,and a straight through system ,so hopefullly the dealers will come with a sensor tommorrow ! many thanks we shall see

Glowplug

iTrader: (8)

The 3 wire LS02 is what you require.

Just Lambda, Suppliers of Bosch and NTK lambda sensors including zirconia and titania sensors by post

Don't be tempted by the cheapo's on ebay, they are a waste of time and money

PeeVee

iTrader: (1)

Morning..

The info you have been given on the Lambda sensors is correct.... The early Jap Imports ran a different voltage sensor to the norm, until 1996 when things were rationalised and they all started to run the 12v items as per all other cars.

You also need to be careful as there are two types of lambda sensor fitted to the early cars.

If you want the Subaru part number of the sensor fitted to your car then I can get this for you from my Japaneese parts program if you give me your vin/chassis no:

jon 928

yes please mate part no would be super my chasi is GC8 -003117 ,I KNOW WITH MOST SENSORS ,the lamda wiring does this have to be specific colour coded ,only reason i ask ,the plug has been cut off .

Glowplug

iTrader: (8)

IIRC their are 3 wires, 1 black and 2 white. Connect black to black and then the 2 whites, it does not matter which way the whites are connected as they are for the heater element

PeeVee

iTrader: (1)

Morning Jon,

Chassis No: GC8-003117

Model: Wrx Saloon

Built: November 1992

Lambda Sensor Part No: 22690AA131

The Wiring Colours are as follows:

Lambda Sensor..........Vehicle Harness

Red/Black------------Yellow/Red - 12V Ign Feed
White/Red-----------White - Sensor Signal Wire
Black/Red------------Black/White - Earth

Phil

jon 928

Many thanks phil your a star matei ,will get 1 ordered tomm ,thanks again guys