Parts for your 2008 Ford Focus-Map sensor

2008 Ford Focus MAP sensor — purpose and servicing tips

Based on Ford Workshop Manual (WSM) coverage for the 2008 Focus fuel and air systems, Ford wiring diagrams (Motorcraft/ETIS), and major catalogues such as Autodata and Ford Microcat, a Manifold Absolute Pressure (MAP) sensor is used on 2008 Ford Focus models sold in Australia and New Zealand. It’s fitted as a charge‑air (boost) pressure sensor on the 1.8/2.0 TDCi diesels, and present on many 1.6/1.8/2.0 Duratec petrol variants as an intake manifold pressure/barometric sensor supporting load calculation and diagnostics. Parts listings (FoMoCo 9F479‑series MAP) and Bosch/Delphi application data corroborate this fitment, so a MAP sensor is relevant on this vehicle.

The MAP sensor’s job is simple but crucial: it reads pressure inside the intake manifold and tells the ECU how hard the engine’s breathing. The ECU then trims fuel, spark, and—on diesels—turbo boost and EGR operation. When it’s healthy, the Focus starts cleanly, idles smoothly, and sips fuel. When it’s crook, expect lazy throttle response, higher fuel use, rough idle, and, on TDCi models, sooty smoke. Common fault codes include P0106, P0107, P0108 and P0069.

Owners can keep the 2008 Focus happy by giving the MAP sensor a quick check every service or two (say, every 20,000–30,000 km). Under the bonnet, the petrol MAP typically mounts on or near the intake manifold, the diesel sensor sits on the manifold or charge pipe. Make sure the electrical connector is clean and tight, and that the vacuum side (petrol) or the sensing port (diesel) isn’t blocked by oil mist or soot. If light cleaning is needed, use electronics/contact cleaner only—never poke the sensing element with tools.

Replacement is straightforward if faults persist. With the engine cool, disconnect the plug, remove the retaining screw, and withdraw the sensor straight out so the O‑ring isn’t nicked. Lightly lubricate the new O‑ring, seat the sensor squarely, and snug the fastener to the workshop spec (small M6 fasteners are typically around 5–7 Nm—always follow the exact spec for the engine). Reconnect, clear any codes, and take a short drive to let the ECU relearn. On diesels, it’s worth checking for split boost hoses and cleaning the intercooler tract if there’s heavy oil carry‑over, as contamination can quickly foul a fresh sensor.

• Watch‑outs: vacuum leaks (petrol), split boost hoses (diesel), corroded connectors, and incorrectly routed harnesses near hot components.
• Good practice: pair MAP checks with air filter inspections and throttle body/EGR cleanliness for a smoother, thriftier Focus.

Popular questions about the 2008 Ford Focus MAP sensor

Does a 2008 Ford Focus use both a MAF and a MAP sensor?
Many petrol variants rely primarily on a MAF for airflow measurement and still use a MAP/BARO signal for load modelling and diagnostics. The TDCi diesels use a MAP (boost) sensor and may also use a MAF ahead of the turbo. It’s normal for these engines to have both, each doing a different job.

Where is the MAP sensor on a 2008 Focus?
On petrol models it’s usually mounted on or near the intake manifold, close to the throttle body. On TDCi diesels, look on the intake manifold or the charge pipe near the intercooler outlet. It’s a small plug‑in sensor with a single retaining bolt and a two‑ or three‑pin connector.

Can a bad MAP sensor cause hard starting or high fuel use?
Yes. If the ECU sees implausible manifold pressure, it can over‑fuel or pull timing, leading to hard starts, flat spots, and higher consumption. A quick scan for P0106–P0108 or P0069, plus checking for vacuum or boost leaks, will usually pinpoint whether the MAP or something around it is to blame.