Hi,

Today my car(classic impreza my99) went suddenly boost cut about .5 bar. idle was rough and check engine lights on.i read error codes, code is 23

i checked the boost leaks but no boost leaks.i disconnected maf cable but nothing changed.

is this directly maf failure? Car running rich and i didn't erase the code(delphi obd device) if i change the maf will ecu erase error code itself?

Car is stock, stock airbox only cat back prodrive

 

Yes it is MAF failure
Year 99 was a weak year for them.
There are three different types of MAF for that year you can get ...from memory. And the last revised one is not too bad

Fault codes here

11 Crankshaft position sensor

12 Starter switch

13 Camshaft position sensor

21 Engine coolant temperature sensor

22 Knock sensor

23 Mass air flow sensor

24 Idle air control solenoid

31 Throttle position sensor

32 Oxygen sensor

33 Vehicle speed sensor 2

35 Purge control solenoid valve

42 Idle switch

44 Wastegate control solenoid valve

45 Pressure sensor / Pressure exchange solenoid valve

51 Neutral position switch


Cheers
Steve

 

When you get a replacement make sure it has this part number on it
C36-700 R92
That means it is a revised one. I guess most of them kicking about now are.

 

thank you

i'll check new part number,

i didn't erase error code, when i install new maf could i reset ecu or do another action?(like connect green and black connectors?)

 

I would do the ECU reset with the green and black connectors

 

thank you very much

 

little update,


i changed maf new one and car runs again without any error

idle is more stable

AFR's at 11.2-10.8 at wot