λ Lambda Sensor

Lambda Sensors measure the Oxygen content in vehicle exhaust gases. A faulty lambda sensor could cause cars to fail MoT exhaust gas emissions test. Further effects may include excessive fuel consumption together with driveability and engine running problems.

Lambda Sensor Supply- Shropshire UK

We supply a range of replacement exhaust gas Lambda sensors for many makes and model of vehicle with internal combustion engines(ICE).

Lambda sensors are fitted to modern vehicle petrol engine exhaust systems to enable monitoring of exhaust gas Oxygen levels, and to diesel engines to monitor NOx emissions.
The Lambda sensors generate an electrical voltage signal output which is sent to the engine management control unit via wiring.
Lambda sensor types are of Zirconia or Titania type construction.
Voltage output level of the λ sensor determines whether the exhaust gas is from a rich or lean fuelling mixture.

Pre Catalytic Converter Lambda Sensor
The Lambda sensor signal is processed by the vehicle engine management computer control unit to calculate and correct engine fuelling at various operating parameters by opening fuel injectors for a shorter or longer period of time (milliseconds). The longer time each fuel injector is open then the greater fuel quantity flowed in to the engine combustion chamber so providing a richer fuel mixture.
Lambda sensors may be fitted before and after the exhaust catalytic converter.

Post Catalytic Converter Lambda Sensor
The Lambda sensor fitted after the exhaust catalytic convertor is used for monitoring efficiency of exhaust gas after treatment as exhaust gas passes through the exhaust system catalytic convertor.
Lambda sensor or wiring failure can cause the engine management dashboard warning light to illuminate


Lambda Sensor Diagnostics
The Stoichiometric ratio of Lambda ( λ) 1 is an ideal engine fuelling ratio which equates to a fuel/air mix of 14.7kg of Air to 1kg Fuel.
Lambda sensors are susceptible to contamination from use of leaded fuel, antifreeze in coolant leaks, oils and fluids which may damage the sensor.
Some Lambda sensors have ceramic heater elements (Heated Exhaust Gas Oxygen or HEGO sensor).
Diagnosis may require reading of fault codes and live data using a scan tool, voltage, or oscilloscope signal testing to monitor sensor values and waveform pattern, also exhaust gas emission analyser. Switching voltages are generally 0.5v to 5v but check manufacturer specification.
Typical Lambda sensor fault codes may include Eobd diagnostic codes :
P0171 System too lean
P0175 System too rich
Long term fuel trim
Short term fuel trim
Open Circuit
Short to Ground
Short to Power
Signal too low
Specific manufacturer fault codes may be present.
The cause of lambda sensor fault codes can be complex to diagnose.
Fault codes may log if incorrect fuelling problems exist due to ignition system malfunction, fuel injection system malfunction, air leaks , or where engine mechanical problems exist or if wiring connection or control unit problems are present. Lambda sensors can deteriorate over periods of time resultng in slow switching and engine running problems.
Fault codes may need clearing after component replacement or wiring repair.
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