928 Tech Tips

LH ecu	Porsche part number	Type	Bosch part number	Bosch Eprom number
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 a '87 S4 * 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)
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
EZK ecu	Porsche part number	Type	Bosch part number	Bosch Eprom number
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	Diag reports: EZ121K2093
1990 GT	928.618.124.22	E01EZK	0 227 400 164	2 227 355 584	Diag reports: EZ121K2128
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

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