Focus Mk3 Oxygen Sensor
Replacement oxygen sensor — fitment, symptoms & live UK prices.
Fits Focus Mk3 — check your reg/VIN to confirm
Oxygen Sensor
£15–£60 each — most cars have more than one.
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Will it fit my Focus Mk3?
Pre-cat (upstream) and post-cat (downstream) sensors are different parts — check which one your fault code points to, and how many your engine has.
Tip: filter by your reg on eBay's compatibility check, or match the part number stamped on your old unit.
Signs your Focus Mk3 oxygen sensor needs replacing
- Engine warning light (O2/lambda code)
- Poor fuel economy
- Rough idle or hesitation
- Failed emissions/MOT
Fitting it yourself
Usually a single plug and a thread into the exhaust — quick if it's not seized. Penetrating oil helps on an old sensor.
See Oxygen Sensor prices on eBayMore Focus Mk3 parts
HeadlightFocus Mk3ExhaustFocus Mk3TurboFocus Mk3Water PumpFocus Mk3Timing BeltFocus Mk3Timing ChainFocus Mk3
Live prices£15–£60 each
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