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Lambdapower - Lambda Oxygen sensors in the UK to trade and DIY international and special orders
UPDATED Monday 1 November 2021
LSM11B news
LSM11B available to order. Ships worldwide, ask for quotation for multiple quantity. Production facility expanded by 20% capacity
LSM11Bs are available to order during November and December. Updated product page with new version of instructions and new dimensional reference drawing.
The LSM11B is our supercession part to the traditional Bosch LSM11B / 0258104002 / 0258104005, developed here and manufactured in-house. See the product HERE
EU destinations & Brexit
All EU customers are more than welcome to order from us. Please contact us for a quotation. Only by pushing forwards can we reverse the Brexit mess and, we hope, return to as far as possible precisely as things were before the leave vote.
Lockdown remains relaxed for the time being, but we will continue to follow established good practice.
  • All manufactured items are wiped down with an anti-COVID solution prior to packing
Recent Additions (Car Sensors)

Automotive Sensors
Use the green button to search for your car step-by-step
Biomass Sensors and Interfaces
Lambdapower AD-12 wideband sensor interface

For development work and O2 data logging, see our USB wideband oxygen sensor interface for industrial and commercial use.

  • 12 volt version available
  • 24 volt version available to special order
  • 0-20mA version available on request

LC-69001 Original Lambdapower Part Bosch LSU4-9 replacement

Top quality Lambdapower branded biomass sensor

  • Premium quality Five-Wire Sensor
  • Individually Serial Numbered for ISO 9001 component traceability
  • Replaces Bosch LSU4-9
  • In stock for overnight delivery to base or to site - avoid extended downtimes

VW NOX sensors
NOX parts are now mostly discontinued, but some NOX sensors are still available from us. A new page is coming soon with our Classic Line sensors for older VAG cars, and bespoke lambda service for modified exhaust systems that require a different cable configuration.
Others / Misc.
Honda Accord F20B6
Honda Accord F20B6 1999-2003 2.0 front pre-cat regulating lambda sensor

Not your Honda? Know your OE part Number? Click here for lots of Honda cross references

Subaru Sensors

2.0, 2.5, Forester, Impreza, etc

We stock a selection of Subaru sensors from 1996 to 2010 for Subaru cars and rear-engine VW Transporter conversions. Contact us if you cannot find the correct sensor. All our sensors are predominantly OEM Denso.

More Subaru listings here

> > OBD-II fault code search

Input your P-codes right here! Click in the box, type, then press GO

>> Lambdapower Part Numbers

To search for our own part numbers, LP- or LC- style, please click in the box, type, and press 'GO'

Mounting Bosses

Lambda mounting bosses, blanking plugs bungs, thru-hole mounting nuts, copper washers, small form factor 12mm and standard 18mm sizes available. See this page for details


Professional Quality 22mm Lambda Oxygen Sensor socket. Suitable for all standard form-factor 22mm hex Zirconium and Titanium sensors. 3/8 inch drive, includes postage.

Oxygen Sensor Thread chaser for cleaning old and corroded oxygen sensor mounting boss threads in manifolds and exhaust systems. For details click here.

What is a lambda sensor?

Very Quick Guide to Lambda Sensors

A lambda sensor is an electronic device that fits into a car exhaust system. It is sometimes called an Oxygen sensor, O2 sensor, or AFR. Its purpose is to send a signal to the ECU (engine control unit) to indicate how much oxygen is in the exhaust gases. This indicates how efficiently the engine is running. The ECU uses this information to adjust the engine's fuelling as you drive.

Lambda sensors can also be used for industrial applications, such as electricity generating stations and biomass boilers, and for general O2 measurement for industrial processes, eg. welding, steel rolling mills, drying ovens, furnaces

What happens if it fails?

MOT emissions failure, excessive fuel consumption, catalyst failure, poor performance, engine check warning light, fault codes are all symptoms that can be associated with Lambda sensor failure. The Lambda sensor's efficiency deteriorates over a period of time.


No maintenance of the Lambda sensor is required and there are no serviceable parts. Similar to a spark plug, when it's worn out it should be replaced.

Where is it?

Mounted on the engine exhaust manifold or exhaust pipe, or under the vehicle for the rear sensor. Modern engines with a close-coupled catalyst have the sensor inside the engine compartment. A close coupled catalyst places the catalyser very close to the engine to shorten warm-up time.

Cars made after year 2000 have at least two sensors, front and rear, and are termed OBDII compliant. Multiple sensors enable the ECU to better judge the efficiency of individual cylinders.

How can I replace it?

Firstly consult our fitting guide - it's roughly the same as fitting spark plugs. Or get your garage to do it. Some garages will not fit 'universal' type sensors, please check with them first before buying one. Direct fit sensors are more expensive, but are preferable to the universal types.

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Diagnostic & Fitting Advice and Technical Procedures are for information only and no liability is implied therein. All site content, text, images, and application lists are copyright ©2003-2021 Lambdapower. If you need to reproduce content please ask for our permission. E&OE
Registered Office: Unit 22A Baltic Works, SHEFFIELD, S9 3QA. 07806 705407. CEO Jamie Field. UK VAT Reg No. 131050672 All rights reserved.