Also called O2 sensor, lambda probe, oxygen sensor.
How you know it is this
- A check-engine light with a lambda or fuel trim code
- Heavy fuel consumption with no other symptom
- Failed emissions at registration
- Rough running when warm but fine cold
Worth knowing before you buy
- There are at least two per bank — upstream, which controls fuelling, and downstream, which only checks the converter. They are different parts and the code says which.
- A lazy upstream sensor costs real money in fuel long before it lights the dash.
- They are poisoned by burnt oil or coolant, so a failed sensor on an engine that uses oil is a symptom.
- They seize into the exhaust. Heat and a proper socket, and allow for the possibility of shearing.
What we need to quote it. The engine code, and the fault code naming bank and position. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.
Rest of the after-treatment
Get in touch
Lambda (oxygen) sensors for your Mercedes-Benz?
Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.
Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)