Ok, the reason I changed mine was the lack of O-Ring between the air flow meter and the airbox. Unfiltered air had been contaminating the hotplate air flow meter for god knows how long. Took the sensor out of the barrel, cleaned with a cotton bud and electrical contact cleaner and it was obvious where i'd been on the hotplate but i couldn't access even half of the area.
Having replaced the air flow meter I now have improved low down torque and throttle response.
Original unit: 0281 002 440 on the barrel, F 00C 2G2 030 (591 24 1C below this) on the sensor inside.
Replacement unit: 0281 002 207 on the barrel, F 00C 2G2 033 (204 13 2C below) on the sensor inside.
The replacement unit is a genuine Bosch unit with a surcharge applied so they want the old unit back.
The main difference I'm going to explore through Bosch's technical department is that my original unit had what appears to be a thermocouple on the hotplate sensor unit whereas the replacement unit has the mounting pins but nothing there.
I would expect this is to provide inlet air temperature.....however....I plugged in our Bosch KTS diagnostic unit at work a few weeks ago before I replaced the meter and the inlet air temp constantly read 215 Celcius!
It does exactly the same with the new unit.
Two options here, either the ECU doesn't read for inlet air temp, or it does and the original unit had a broken thermocouple.
Will report when I know more.
Having replaced the air flow meter I now have improved low down torque and throttle response.
Original unit: 0281 002 440 on the barrel, F 00C 2G2 030 (591 24 1C below this) on the sensor inside.
Replacement unit: 0281 002 207 on the barrel, F 00C 2G2 033 (204 13 2C below) on the sensor inside.
The replacement unit is a genuine Bosch unit with a surcharge applied so they want the old unit back.
The main difference I'm going to explore through Bosch's technical department is that my original unit had what appears to be a thermocouple on the hotplate sensor unit whereas the replacement unit has the mounting pins but nothing there.
I would expect this is to provide inlet air temperature.....however....I plugged in our Bosch KTS diagnostic unit at work a few weeks ago before I replaced the meter and the inlet air temp constantly read 215 Celcius!
It does exactly the same with the new unit.
Two options here, either the ECU doesn't read for inlet air temp, or it does and the original unit had a broken thermocouple.
Will report when I know more.
id of been 12 when it was first created!....sorry, that im 0% helpful here:augie
