"Performance reduced" warning message

[ChristoT]

Originally Posted by cheshired5

Clear the codes, take it for a drive then see which codes come back.

Did so, the error code that has come back was the mass airflow issue. Clearing the codes seemed to help a bit, which was surprising. However, didn't take long for the revs to start fluctuating at idle.

What would the turbo code be symptomatic of? I ask as when I got the first 3 readings, the app showed all as "active", even after refreshing several times.

[cheshired5]

Go into real time information and bring up the dial for the MAF.
Post your figures and unit of measurement for 1,2,3,4k revs.

[daveyb]

Have you tried getting some cleaner for the maf then

[ChristoT]

Originally Posted by cheshired5

Go into real time information and bring up the dial for the MAF.
Post your figures and unit of measurement for 1,2,3,4k revs.

Hi Cheshired,

See the graphs below. I had issues on 2000 and 3000 rpm with the pulsing. The 1000 reading was taken at idle - approx 700 rpm.

All MAF readings in g/s

1000 rpm.jpg
1000 rpm

2000 rpm.jpg
2000 rpm

3000 rpm.jpg
3000 rpm

4000 rpm.jpg
4000 rpm

Got the app set up to give me audio warnings when the OBDII reader is plugged in, I got several MAF warnings from the app (but nowt on the dash).

How do I go about cleaning the MAF, Davey? Or is it cheap enough to replace?

[daveyb]

This is the stuff to cean the sensor

https://www.amazon.co.uk/Sensor-Mass.../dp/B00GE5K6Q8

It's basically spraying it so it clears all the debris of the small sensor

A new sensor from europarts is £89 upto £205 for a Bosch one

[cheshired5]

MAF sensor looks fine to me so I wouldn't touch it for now.
Maybe unplug it and see it drives better.