Voltage jump probe. Resistance jump probe. Lambda sensor heating. Broadband lambda sensor. Use of multiple lambda sensors. A faulty lambda sensor can cause the following symptoms: High fuel consumption Poor engine performance High exhaust emissions Engine indicator lamp comes on Error code is stored. Unheated probes. Diagnosed faults Cause Protective tube or probe body clogged with oil residues Unburned oil has found its way into the exhaust system, e. As part of the EOBD, the lambda sensor monitoring has been expanded to include the following points: Open circuit, Operational readiness, Short circuit to control unit ground, Short circuit to positive Cable break and lambda sensor aging.
For this, the control unit calculates the following data: The maximum and minimum detected sensor voltage value, The time between the positive and negative flank, Lambda controller regulating variable according to rich and lean, Control threshold of the lambda control, Probe voltage and period duration.
Response time: The frequency of the probe is too slow, optimal control is no longer possible. Checking the lambda sensor with the exhaust tester. Exhaust tester. One of the quickest and easiest tests is to measure with the four-gas emission analyser. Checking the lambda sensor with the multimeter. Only high-impedance multimeters with digital or analog display should be used for the test. Checking the lambda sensor with the oscilloscope.
Lambda sensor signal pattern. The engine speed should once again be approx. The following parameters can be evaluated at this signal: Amplitude height maximum and minimum voltage 0. Checking the lambda sensor using the lambda sensor tester.
Lambda sensor tester. Checking the condition of the protective tube. Engine running with mixture that is too rich The probe should be exchanged and the cause for the excessively rich mixture remedied, to prevent the probe from becoming sooted again.
Use of leaded fuel The lead destroys the probe element. Engine burns oil, additional additives in the fuel The probe must be replaced and the cause for the oil burning remedied. The internal resistance and voltage supply of the heating element can be checked. Different connection options and cable colors. Heated probes.
Number of cables Cable colour Connection 3 Black 2 x white Signal ground via housing of heating element 4 Black 2 x white Grey Signal, heating element, ground. Titanium dioxide probes. Replacement of the lambda sensor. Replacement of the lambda sensor inc. The following must be noted during replacement of the lambda sensor.
If a lambda sensor is replaced, the following should be noted during mounting of the new probe: During removal and mounting, only use the specific tool intended for this purpose. Check the thread in the exhaust system for damage. Only use the grease supplied, or grease which is specifically intended for lambda sensors. Avoid bringing the probe's measurement element into contact with water, oil, grease, cleaning agents, and rust removal agents.
Observe the respective tightening torques specified by the lambda sensor manufacturer and vehicle manufacturer. When routing the connecting cable, ensure that it does not come into contact with hot or mobile objects and is not routed over sharp edges. Route the connecting cable of the new lambda sensor according to the pattern of the originally installed probe as far as possible.
Based on this information, a calculated amount of fuel required by the engine to burn at a stoichiometric ratio is released, ensuring complete combustion.
In automobiles two Lambda sensors are used — one installed before the catalyst converter, which controls the system and the other installed behind the catalyst converter, to make sure the former one is working properly. The actual number of Lambda sensors present in a car depends on the year, make, model and engine of the car.
Lambda sensors oxygen sensors help in improving the performance of the vehicle by avoiding costly damage of CAT. Use of good Lambda sensor can cut the fuel intake of the vehicle up to 15 percentage. This sensor is highly helpful for low fuel consumption, low pollutant emission, check exhaust emission values. The multimeter should be connected parallel to the signal line of the sensor and set to 1V or 2V.
When you start your engine, a reading between 0. Once the engine is up to temperature, the reading should alternate between 0. The ideal engine speed for the best measurements should be at 2,rpm. Connect the oscilloscope to the signal line. Set a voltage range of 1—5V and a time setting of 1—2 seconds and again, run the engine at 2,rpm. The amplitude height of the waveform will deliver your maximum and minimum voltage 0.
You can buy a device purely designed for the measurement of your Lambda sensor. As you would with an oscilloscope or multimeter, connect the tester to the signal line, and when you achieve the correct temperature, your reading will be displayed using the LED scale.
When it comes to replacing your sensor , here are a few tips for a clean and correct installation:. Fixter is revolutionising the car maintenance industry, one repair at a time. Fixter was founded to make car maintenance as easy as booking a taxi. Digital, transparent and stress-free, with world-class customer service. Use a specialized socket to facilitate the removal of the lambda sensor. Check for the right application at the catalogue, similar applications may have different reaction time, not being equivalents.
Use grease around the thread on the new sensor to make it easier to install the sensor now and remove it again at a later date. The sensor can be threaded into place by hand and tightened with the special socket to its right torque specified at the service manual of the vehicle. Take a step closer to the action, and watch a Garage Gurus expert show you exactly how to check, remove and replace a lambda sensor.
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