Fault 2: FAILING MAP SENSOR

When this problem arises, symptoms will include a lack of power, probably more noticeable going up hills, and it’ll be evident that the car doesn’t respond as well as it should.

Carrying out a diagnostic check of the engine ECU, the operator will almost certainly see a fault code showing

‘P106 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/ BAROMETRIC PRESSURE RANGE/ PERFORMANCE PROBLEM’.

Standing at the front of the car and looking into the engine bay, the MAP sensor is literally right in front of you and held in place via a Torx 30 screw, so it’s very easy and quick to reach.

It’s worth checking and cleaning the MAP sensor with a ‘soft’ cleaner cloth at every service – you will likely see it soiled with residue from the manifold. Edward advises that in his experience all that’s required is a good clean, then it’s as good as new.

However, if available, you can look at live data with key on, ignition on. Looking at ‘MAP sensor’, you should see a minimal reading with engine off, ignition on, but when they become dirty these sensors show all sorts of readings, confusing the engine ECU in terms of manifold pressure. No coding is required if replacement is needed, just fit the new sensor and it should work!

Always opt for high-quality replacements; don’t be tempted with ‘bargain’ components – some of which are available online. As with so many things, cheap doesn’t always mean inexpensive in the long run.