Our sensors are only top-quality OE spec items made by FACET BOSCH WALKER or the original equipment manufacturers.
The advantages of top-quality sensors
They comply 100% with the vehicle manufacturer's specifications, each sensor is tested, will have a long service life. Serves to optimise fuel consumption, engine output, driving properties, and ensure emissions are low.Up to 10% fuel saving in comparison to a significantly aged or faulty Lambda sensor. Prevents the possibility of damage to the catalytic converter or MOT emissions failure on lambda control loop.
Lambda For older cars
For older cars where the original lambda sensor can be changed to a universal O2 / lambda sensor we have a cheaper range of sensors these are our part numbers PL7001 to PL7004 1 to 4 wires these can be used in most older cars. Not recommended for Japanese cars.
Bosch Universal Lambda sensor
Bosch produces a universal sensor but limit the vehicles they say it can be safely connected to. These are our numbers PL7005 to PL7021.
Wiring types
The sensor on your vehicle will have different numbers of wires according to which type of sensor it is.
There are ranges of wiring systems on the lambda sensors these range from 1 wire to 5 wires,
Single wire Lambda sensors are the earliest and most basic type of sensor with only a single signal wire. The sensor gets its operating heat from the exhaust gases themselves, and has a return ground (or if you prefer - earth, negative, 0v) path through the exhaust and manifold to the engine.
Two wire Lambda sensors have an extra ground path down one of the wires. There can be a surprising amount of voltage difference between earth points on a car, and supplying 0v through a separate wire reduces the amount of noise in the signal, caused by for example rusty manifold bolts or poor engine earth connections.
Three wire lambda sensors have a signal wire and two heater wires. This brings the sensor up to operating temperature quickly and keeps it there even when the exhaust is running cool, for example during idling.
Four wire sensors have an additional ground as described for the two wires, and also a heater (two wires).
Signal wires are black, the added earth will be grey, and the two heater wires are normally white. The heater wires are not fussy about polarity, which explains their identical colour.
A Five-wire sensor is identified as a wideband sensor, and normally the harness plug has one or two spare pins (seven pins in total). The extra wires of the wideband sensor are used to supply a bias voltage to a chemical device known as andoxygen pump', which modifies the behaviour of the Zirconia element and provides a much more accurate measure of exhaust gas O2 content.
|
Fitting your new Lambda Sensor origanal fit
Fitting the new sensor If fiting the origanal fit unit
Fitting the new sensor If fitting the original fit unit, this is a very simple possesses, please make sure the car is cool before you proceed, you will need to make sure you have a good quality lambda sensor spanner. First make sure the ignition is turned of, then disconnect the plug from the main wiring loom, unscrew the lambda sensor anti clockwise , when replacing smear the copper grease supplied on the thread bolt back in reconnect the wiring loom.
Fitting your new Lambda Sensor universal fit
If fitted the Universal sensor make sure the wiring is the same colour before you begin work
Cut the original wire of the old lambda sensor so you have enough wire with the plug on that the total length when spliced with the new sensor is the same or slightly longer than the original oxygen sensor wire. Strip 3-4mm of insulation from the end of the cut wire. Using the heat shrink (supplied) slide over the wire. Put correct colour ends into either end of the metal connector It is recommended to solder the terminal. Slide the heat shrink tube over the terminal. Heat the tube with a heat gun or lighter, until it shrinks and weather seals the terminals. Do not over heat.
Most modern cars need only to have the sensor changed every 30,000 miles, if the car is being driven normally, excessive short journey town driving can shorten the life, therefore it is advisable to have the emission checked more often.
A major concern with a faulty or worn out lambda sensor is excessive fuel usage, and the damaged the can be caused to the catalytic coverter over heat,
once this happens a new catalytic coverter is needed.
Different types of oxygen sensor.
Zirconia lambda sensor
A 1-Wire Oxygen Sensor may also be referred to as an EGO Sensor (Exhaust Gas Sensor) The single wire on this sensor delivers the signal while the ground is achieved through the metal sensor body where it screws to the exhaust manifold. This type of sensor was quickly replaced by the 2 wire sensor because the threads where the sensor screws into the exhaust can easily become corroded resulting in a degraded ground connection leading to faulty sensor readings. On the 2 wire sensor, one lead delivers the signal while the second lead is the ground. 3 Wire Oxygen Sensor may also be referred to as a HEGO sensor (Heated Exhaust Gas Oxygen Sensor). Their operation is similar to 1 wire lambda sensors, except they have an internal two wire pre-heater which enables the sensor to more rapidly achieve proper operating temperature. One wire carries the sensor signal while the other two wires supply voltage to the internal heater. Like a 1 wire sensor, the signal ground is achieved through the sensor body where it threads into the exhaust system.4 Wire Oxygen Sensor may also be referred to as an I-HEGO sensor (Isolated Heated Exhaust Gas Oxygen Sensor). Their operation is similar to 2 wire sensors, except they have two additional wires for an internal two wire pre-heater which enables the sensor to more rapidly achieve proper operating temperature.
These are the first type of oxygen sensors made these type these were made with 1 to 4 wires
Titania Lambda sensor
A titania style sensor does not generate its own signal or voltage, it receives 5 volt from the ECU and sends back a signal from 1000 ohms resistance (on a rich mixture) to 20,000 ohms resistance, (on a lean mixture) depending on the current air fuel mix.
These are more expansive but also more reliable, made with 3 or 4 wires these have a higher heater resistance of 4- 7 ohms the out put is normally 0-1 volt
Wide Band Lambda Sensors.
These are the latest type with 5 wires. Other differences between the 5 wire wide band oxygen sensor and the zirconia type are, the 5 wire wide band operates at about 1200 to 1500° Fahrenheit instead of the standard operational temperature of about 600° (316° Celsius). Also it does not produce its own voltage; it is reliant on a controller or ECU to supply a reference voltage to operate. Based on the oxygen content of the exhaust, the sensor delivers a signal ranging from 5 volts for a rich mixture to 0 volts for an extremely lean mixture (0.0 volts for straight air), A standard zirconia sensor reported a simple binary signal of greater or lesser than 450 millivolts.
|
