Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1998 Mercedes Benz E300FACTORY OEM SERVICE PROCEDURE
Component/Circuit Identification
System components and connections are identified by the manufacturer with special designations in diagnostic information. See COMPONENT/CIRCUIT IDENTIFICATION table.
COMPONENT/CIRCUIT IDENTIFICATION
| Component/Circuit | Manufacturer's Designation |
|---|---|
| Boost Pressure Control/Pressure Control Flap Vacuum Transducer | Y31/5 |
| Crankshaft Position (CKP) Sensor | L5/6 |
| Cruise Control Switch | S40 |
| EGR Lifting Sender | B28/3 |
| EGR Valve Vacuum Transducer | Y31/1 |
| Electronic Ignition Lock Control Module | N73 |
| Electrohydraulic Shut-Off Actuator | Y1/1 |
| Electronics Output Ground-Right Footwell | W15 |
| Engine Coolant Temperature (ECT) Sensor | B11 |
| Fuel Rack Position Sensor | Y23/1l1 |
| Fuel Temperature Sensor | Y1/1b1 |
| Fuel Quantity Actuator (IFI) | Y23/1 |
| Hot Film MAF Sensor | B2/5 |
| IFI Accelerator Pedal Position Sensor | R25/2 |
| IFI Control Module | N3/7 |
| Intake Air Temperature (IAT) Sensor | B17 |
| Mass Airflow Sensor (MAF) | B2/5 |
| Passenger Side Fuse & Relay Module Box | K40/4 |
| Preglow Control Unit | N14/2 |
| Pressure Sensor | B28 |
| Relay Module | K40 |
| Starter Lock-Out/Backup Light Switch | N15/3 |
| Stop Light Switch | S9/1 |
| Transmission Control Module | N15/3 |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.