LH ecu Porsche part number Type Bosch part number Bosch Eprom number  
1987 928s4 928 618 123 10 L00 LH-JET 0 280 002 504 2 287 355 832  
1988 LH (S4) 928 618 123 11 L00 LH-JET 0 280 002 504 2 287 355 447  
1989 GT LH 928 618 123 14 L01 LH-JET 0 280 002 506 2 287 356 486  
1991 928s4 automatic 928 618 123 25 L01 LH-JET 0 280 002 508 2 287 356 877  
1991 5-speed (GT) 928 618 123 26 L01 LH-JET 0 280 002 509 2 287 356 878  
           
1985/86 S3 928.618.124.05 EZ58F 0 227 400 013 2 287 355 417 BOSCH 27C32
1987 S4 928.618.123.10 LH 2.3  L00LH-JET 0 280 002 504 2 287 355 352 found in one of my '87 S4's #1022 ** this does support diagnostics - so seems like all LH2.3 chips do **
1987 S4 928.618.123.10 L00LH-JET 0 280 002 504 2 287 355 447 (found in a '87 S4's )
1987 S4 928.618.123.10 L00LH-JET 0 280 002 504 2 287 355 832  
1988 S4 928.618.123.11 L00LH-JET 0 280 002 504 2 287 355 447 (probably late '87, see above)
1988 CS/SE 928.618.123.12 ?? 0.280.002.506 ??  
1989/90 S4 928.618.123.13 L01LH-JET 0 280 002 507 2 287 356 487  
1989/90 GT/CS 928.618.123.14 L01LH-JET 0 280 002 506 2 287 356 486  
1991 S4 928.618.123.25 L01LH-JET 0 280 002 508 2 287 356 877  
1991 GT 928.618.123.26 L01LH-JET 0 280 002 509 2 287 356 878  
1992/95GTS 928.618.123.30 L01LH-JET 0 280 002 514 2 287 357 477  
           
1987 S4 928.618.124.11 E00EZK 0 227 400 035 2 227 355 480 no diagnostics
1988 S4 928.618.124.11 E00EZK 0 227 400 035 2 227 355 520  
1989/90 S4 928.618.124.15 E01EZK 0 227 400 154 2 227 355 544  
1990 GT 928.618.124.22 E01EZK   2 227 355 584  
1991 S4 928.618.124.15 E01EZK   2 227 355 334  
1992/95 GTS 928.618.124.30 E01EZK 0 227 400 197 2 227 355 341  
1995 GTS 928.618.124.30 E01EZK   2 227 355 584 Chip may not be original
           
           

 

Non verified...

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928 L-Jetronic controller part numbers

Label
Year Porsche P/N Bosch P/N Color
1980 928.618.106.01 0 280 002 101

1981 928.618.106.04 0 280 002 104 blue
- 1984
 

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928 LH-Jetronic controller part numbers

25-Pin Modules Label
Year Porsche P/N Bosch P/N Color
1984 928.618.123.00 0 280 002 501 black

1984 928.618.123.00(02) 0 280 002 501 black
to 1986: Euro M28.21/22

1985 928.618.123.03 0 280 002 502 blue
- 1986: US-Spec M28.43/44

1985 928.618.123.04 0 280 002 503
- 1986: US-Spec M28.43/44/45/46
 

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35-Pin Modules

Label
Year Porsche P/N Bosch P/N Color
1987: 928.618.123.10 0 280 002 504 blue

1988: 928.618.123.11 0 280 002 504 orange

1988: 928.618.123.12 model M 637 (GT model, manual transmission)

1989 928.618.123.13 0 280 002 507 lilac
- 1990

1989 928.618.123.14 0 280 002 506 green
- 1990: model (M637 = GT model, M639 = manual transmission)

1991: 928.618.123.25 0 280 002 508 brown
model (M 249 = Automatic transmission)

1991: 928.618.123.26 0 280 002 509 da.blue
model (M 481 = Manual transmission)

1993 - 1995: 928.618.123.30
 

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EZF Module

Year Porsche P/N Bosch P/N Color
1984 – 1986: 928.618.124.03 0 227 400 012 Black
Euro M28.21/22

1985 - 1986: 928.618.124.05 US-Spec M28.43/44

EZK Module
1987: Early 928.618.124.10 (small “hook” clip), Later: 928.618.124.11 (LH type clip)
1988: 928.618.124.12, 14, 15
1988 - 1989: 928.618.124.13 (M637 = Club Sport)
1990: 928.618.124.16 (M637 = Club Sport)
1989 - 1990: 928.618.124.22 M 639 (GT model and manual transmission)
1989 - 1991: 928.618.124.15 model M 249 (Automatic transmission)
1991: 928.618.124.26 model M 481 (Manual transmission)
1993 - 1995: 928.618.124.30

EZK Specifics
Label
Year Porsche P/N Bosch P/N Color
1987 928.618.124.10 0 227 400 035 orange
1987 928.618.124.12 0 227 400 035 orange
1991 928.618.124.15 0 227 400 154

Bosch ECU part number Scheme
0 227 = Ignition only for ignition)
0 261 = Motronic/DME/Ladedruckregelung fuel + ignition
0 263 = " " newer generation
0 265 = ABS
0 280 = Jetronic (Monojet/L-Jet/LH-Jet/LE-Jet.. fuel + Lambda regulated
0 281 = Diesel