universal lamba wiring

i have just ordered a 4 wire lamba sensor, is the wiring easy to suss??

If you know the pin-outs for the sensor you have bought, yes. Someone on here should be able to stump up the colours in the Supra loom to match, You'll have a heater live and a heater ground and a signal live and a signal ground.

Is this to replace the standard O2 sensor? The stock NA O2 sensor only has 2 wires.

does the flange holder seperate from the sensor on the genuine one?? as the universal one doesent come with a flange

also thses are the wires on it

Four Wire Universal Sensor

Wire Colour Connection

Black Signal

Grey Earth

White Heater

White Heater

No, you need a 2 bolt flange adaptor. I keep these, and my O2 sensors come with wiring swap over instructions, didn't yours?

sensor has arrived, with a flange ! bonus just need wiring steps .......... cheers!

Four Wire Universal Sensor

Wire Colour Connection

Black Signal

Grey Earth

White Heater

White Heater

These instructions are intended as a guide only

and are not a substitute for a workshop manual.

The fitter must have a degree of mechanical

competence. If you are in any doubt as to your

ability to fit the part, do not undertake the job.

Lambda Instructions

Safety

Warning, lambda sensors are fitted into the

exhaust system and operate at very high

temperatures. Allow the vehicle to cool fully

before attempting to remove the old sensor.

Take proper precautions to prevent injuries from

burns etc. The old sensor will probably be very

tight . Take proper precautions to prevent

injuries when removing it. As with any work that

involves working under a vehicle ensure that it is

chocked and propped (correctly) before commencing.

Removing the old sensor

1 Disconnect the battery

2 Disconnect the oxygen sensor electrical

connector

3 Unclip lambda wire loom as necessary

4 Unscrew and remove the oxygen sensor,

the sensor may be very tight. Use the

correct lambda sensor socket to

help prevent injuries

Fitting the new sensor

CAUTION, check for damage to the threads in

the lambda sensor boss in the exhaust. If these

threads are damaged then damage to the new

sensor will occur when fitting.

1 Cut off the original sensor wires

approximately 50mm closer to the

lambda sensor than the new universal

sensor. I.E. the wires of the old sensor

without the plug on should be 50mm

shorter than the wires on the new

replacement sensor (see diagram).

2 Strip back 5mm of insulation from each

of the connector wires

3 Slip a heat shrink tube over each of the

connector wires

4 Using the crimp type connectors

supplied, crimp the wires colour to

colour

5 Slide a heat shrink tube over each of

the exposed crimp connectors and

shrink the tube with a heat source (a

match/lighter will suffice but please

take precautions to avoid fire risks (to

weather seal the connections.))

Hint, an improvement can be made by

staggering the connections, see following

diagram

Soldering the joints is also possible and

recommended, ensure you use silver solder.

CONNECTION MADE WITH BUTT CONNECTOR & SHRINK TUBE

TYPICAL FOR 2, 3 & 4 WIRE SENSORS

CAUTION the wire colours should match

the original sensor. If they are different

please see the diagrams over the page.

We are not responsible for incorrect

wire connections.

Screw in the new sensor

CAUTION; The oxygen sensor may have

a protective sleeve fitted over the

threaded area, remove this cap before

fitting the sensor. The threads will be

coated with an anti-seize compound to

assist later removal. Do not remove this

coating. Do not allow this coating to get

onto the sensor tip or damage may occur.

6. Clean Lambda threads in exhaust.

7. Screw the sensor fully home until

finger tight. Tighten to a maximum

torque of 35lbs./ft or consult your

service manual for vehicle specific

data.

CAUTION do not exceed 35lb/ft. Damage

to the lambda sensor may occur if this

torque is exceeded.

8. Reconnect the sensor’s electrical

connector.

9. Re-secure the lambda sensor

wiring loom as the original equip

ment loom.

10. Reconnect the battery

11. Following the procedures outlined

in your vehicle’s service manual to

clear any fault codes that may

have been set (you may need to

use a fault code reader).

Note failure to do this may cause the

onboard computer to register a fault

and stay in “limp home” mode which

may damage the catalytic converter or

other emission equipment.

.

3 & 4 Wire Sensors

Alternative Wire Colours;

BLUE = Signal (Previously Black)

WHITE = Earth (Previously Grey)

BLACK x 2 = Heater (Previously White)

NOTE: On some vehicles fitted with a

four wire lambda sensor it may be

necessary to make a small modification

to the wiring loom on fitting the

sensor.

If when the sensor is fitted in accordance

with the enclosed fitting instructions

the sensor fails to operate the

following modifications will need to be

carried out.

An additional parallel earth connection

must be made to the grey wire. If

you are unsure about this modification

please contact your supplier.

Trouble shooting

If the sensor fails to operate;

Check the connections, especially

universal types.

Lambda sensors operate at very

low voltages a high resistance

connection can cause a voltage

output error.

Check for air leaks into the

exhaust system between the

engine and lambda sensor. This

is a commonly overlooked fault

that can cause a lambda sensor

miss-reading fault.

Check the heater circuit supply

voltage/return (if applicable).

Check the pre-catalyst emissions

and compare this to

the lambda sensor output.

Periodic Maintenance

Lambda sensors should be replaced

periodically following the vehicle

manufacturer’s recommendations,

normally every 35,000 - 40,000 miles,

because the working surface loses

efficiency over time due to chemical

contamination caused by combustion

gases.The sensors become progressively

less sensitive, even in correct

engine running conditions. They should

be considered a consumable item like

spark plugs and cambelts etc. Missing

periodical replacement causes increased

fuel consumption, poor engine

performance, environmental pollution

and fast deterioration of the catalytic

converter (much more expensive).

Lambda Sensor Deterioration

As a general rule, all lambda sensors

are very sensitive to lead, coking,

unburnt hydrocarbon, oil vapour, silicon

and coolant contamination. Note that:

1 Lack of regular engine

maintenance can damage the

lambda sensor.

2 Carbon coking and unburnt

hydrocarbons (due to a rich

mixture) damage the lambda

sensor.

3 Lead contamination, due to poor

quality petrol or erroneous use of

leaded petrol, causes fast

deterioration of the lambda

sensor.

4 Silicon contamination due to bad

green petrol also quickly

deteriorates lambda sensors.

5 Coolant contamination, due to

leakage of engine gaskets,

causes fast deterioration of the

lambda sensor.