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got it back from the garage after a week of them faffing about and doing not much.
was told it was a major engine fault, would need stripped and turbo replaced (even though it was running fine....) and probably not worth doing as it would be at least a day and a half's labour.
So, went home, bought replacement MAP sensor, bought a tub of engine flush and a tub of turbo cleaner additive, bought iCar Soft diagnostic tool, do diagnostics, replace sensor, delete error codes, add flush, drive about, all good. Add turbo cleaner, top up, drive about at high revs. Still all good. Total cost about £95.
For a supposed Fiat specialist I'm a bit confused how a garage can be so fucking useless. Now deliberating on trading it in for a petrol engined Fiorino or Qubo as I doubt I'll be doing the kind of long motorway miles that will keep the DPF and electronics working ok.
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lynx
Depends, how much 'work' do you want to do?
What OBD2 reader and software do you have? Have you tried https://www.multiecuscan.net/
First think is always to check the connector and connection to the sensor, then depending on the sensor type, check the sensor resistance. See if there is a published resistance range.