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Petrol Injection 1
Petrol Injection 2
Petrol Injection 3
Petrol Injection 4
Petrol Injection 5
B-Dir. Combustion
Dir. Petrol Injection 1
Dir. Petrol Injection 2
Dir. Petrol Injection 3
Dir. Petrol Injection 4
Dir. Petrol Injection 5
Petrol Injection Kugelf.
Homog. Working
Stratified-charge Oper.
Fuel Distrib.
Induction System
Petrol Injection Signal 1
Petrol Injection Signal 2
Idle Speed Device
Mass Air Flow Sensor 1
Mass Air Flow Sensor 2
Mass Air Flow Sensor 3
System Press. Reg. 1
System Press. Reg. 2
Injection Valve
Ind. Pulse Generator
Single Point Injection 1
Single Point Injection 2
Single Point Injection 3
Single Point Injection 4
Unregistrated Air
Lambda Sensor 1 - Generally
Lambda Sensor 2 - Finger Sensor
Lambda Sensor 3 - Planar Sensor
Lambda Sensor 4 - Voltage
Lambda Sensor 5- Broadband
Lambda Sensor 6 - Repair
Thermo Time Switch
Side-channel Pump
Peripheral Pump

First Fuel Pump
Petrol Injection Pump
D-Jetronic (MPI)
KE-Jetroncic - Test, Diagn.
Vol. Air Flow Sensor
Idle Speed Device
Aux. Air Valve
Thermo Time Switch
Roller Vane Pump

Petrol injection 1
Petrol injection 2
Petrol injection 3
Petrol injection 4
Petrol injection 5
Petrol injection 6
Petrol injection 7
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Petrol injection 10
Petrol injection 11
Petrol injection 12
Petrol injection 13
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Petrol injection 15
Petrol injection 16

Lambda Sensor 3 - Planar

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The technology of the planar probe probably corresponds to the working method in electronics. Also other components are produced at a reasonable price in some sort of layer technology. However, much more important is the fact that the measuring cell becomes smaller and lighter and can be heated faster. Also the power consumption of the lambda oxygen sensor is important. In addition, a certain construction equality is established with the broadband probe, produced in larger quantities.

How it works

In principle, this lambda oxygen sensor works like the finger sensor. Through several layers of foils and conducting paths a hollow cavity opens to the right. Surrounding air penetrates into the opening. The heating is completely integrated. It is installed as a conducting path (green) on the floor of the hollow cavity with an isolation layer on top and below.
Upwards the surrounding air first hits the inside electrode (red) which is connected - like with the finger sensor - with the control unit. Without electrons the oxygen flows through the sensor foil to the outside electrode (blue) which is connected with the case (ground) of the lambda oxygen sensor. The sensor foil fulfils the same task as the ZrO2 with the finger sensor. And also here it is protected by a porous protective coating and a metal cover with corresponding openings.


The area of the hollow cavity which is lined by a conductive foil (inside electrode) is called measuring cell.

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