Description
Restore proper ignition operation in your classic Mercedes-Benz with this genuine OEM Bosch EZL electronic ignition-control module.
This discontinued Bosch EZL unit controls ignition timing and coil operation in select Mercedes vehicles equipped with the early 3.0L M104 24-valve inline-six engine.
Product Details
- Genuine Mercedes-Benz/Bosch OEM component
- Bosch part number: 0 227 400 736
- Compact Bosch number: 0227400736
- Mercedes-Benz part number: 0105459532
- Formatted Mercedes number: 010 545 95 32
- Complete Mercedes number: A 010 545 95 32
- Bosch trade designation: EZ 779
- Component type: EZL ignition-control module
- Engine family: M104
- Engine configuration: 3.0L 24-valve inline-six
- Six-cylinder application
- Country of manufacture: Germany
- Includes only the module and components shown in the photographs
Vehicle Compatibility
Mercedes-Benz R129 SL-Class
- 1990 Mercedes-Benz 300SL
- 1991 Mercedes-Benz 300SL
- 1992 Mercedes-Benz 300SL
- 1993 Mercedes-Benz 300SL
For applicable vehicles equipped with the early 3.0L M104 24-valve engine.
Mercedes-Benz W124
- 1990 Mercedes-Benz 300CE
- 1991 Mercedes-Benz 300CE
- 1992 Mercedes-Benz 300CE
- Select 300E-24 and 300TE-24 applications using the identical module
Availability and model designation vary by market. The buyer must match the complete Bosch and Mercedes numbers.
Part Numbers
- 0227400736
- 0 227 400 736
- 0105459532
- 010 545 95 32
- A0105459532
- A 010 545 95 32
- Bosch designation: EZ 779
Do not automatically substitute:
- 0227400738
- 0125452032
- 0165450432
- Other visually similar Bosch EZL modules
These modules may have different ignition maps, engine calibrations, knock-control configurations, or vehicle applications.
For the lowest return risk, replace Bosch 0227400736 with the same Bosch 0227400736.
Important Engine Requirement
This module is intended for select vehicles equipped with the early 3.0L M104 24-valve engine.
It should not be advertised as a direct replacement for:
- M103 12-valve engines
- Later 3.2L M104 engines
- Four-cylinder or V8 engines
- Vehicles requiring Bosch 0227400738
- Vehicles carrying a different original EZL number
The car’s year and model alone are not enough to guarantee compatibility.
Common Failure Symptoms
A faulty EZL module may cause:
- Engine cranks but does not start
- No spark
- Intermittent hot no-start
- Engine stalls after reaching operating temperature
- Vehicle restarts after cooling
- Weak or inconsistent spark
- Misfire under acceleration
- Sudden engine shutdown
- Difficult hot starting
- Ignition coils fail to trigger correctly
Similar symptoms may also be caused by the crankshaft-position sensor, ignition coils, distributor components, wiring, grounds, fuel delivery, or charging-system voltage. Proper diagnosis is recommended.
Condition Details
This is a used genuine Bosch electronic component. It may show normal scratches, dust, faded labeling, oxidation, thermal-compound residue, or other signs of previous installation.
Removed from a running vehicle and tested before removal. The engine started, ran, and reached operating temperature without EZL-related faults.
Critical Installation Requirement
The EZL module uses its mounting surface as a heat sink. Old thermal compound must be carefully removed and an appropriate layer of fresh heat-transfer compound must be applied during installation.
Installing or operating the module without proper heat-transfer compound may cause overheating and permanent failure.
Professional installation is strongly recommended.
Programming
Programming is not normally required when installing an exact-number replacement. However, the Bosch and Mercedes numbers must match the correct engine and ignition calibration.
Buyer Verification
Before ordering, compare:
- Bosch number 0 227 400 736
- Mercedes number 010 545 95 32
- Electrical connectors
- Connector keying and pin configuration
- Housing and mounting points
- Engine type
- Vehicle VIN and production date
If unsure, send Oz’s Garage the VIN and clear photographs of the original module’s label and connectors.
Warranty
Covered by Oz’s Garage’s 30-day replacement warranty.
The warranty provides a replacement when available. International warranty claims are handled through replacement or store credit according to Oz’s Garage policy.
The warranty does not cover:
- Incorrectly ordered modules
- Installation or diagnostic labor
- Missing or incorrect thermal compound
- Damage caused by faulty ignition coils or wiring
- Electrical shorts or incorrect charging voltage
- Water or moisture damage
- Installation in an incompatible engine
- Opened or internally repaired modules
- Modified, altered, or disassembled electronics
Installed, opened, modified, or altered electronic components are not returnable.
Shipping
- Free shipping within the continental United States
- Worldwide shipping available
- Carefully packaged to protect the housing, connector pins, and electronics
- International customers are responsible for applicable customs duties and import taxes
- Usually Ships within 2 / 3 Business Days
