Description
Genuine Bosch Mercedes-Benz KE-Jetronic Air Flow Meter
Genuine OEM Bosch mechanical air-flow meter / airflow sensor plate assembly, part number 0438121001.
This component is part of the Bosch KE-Jetronic continuous fuel-injection system used on select Mercedes-Benz vehicles equipped with the M102 gasoline engine.
The air-flow meter measures incoming engine airflow mechanically through the sensor plate and works with the KE-Jetronic fuel system to regulate the amount of fuel delivered to the engine.
Bosch Part Number
0438121001
Also written as:
- 0 438 121 001
- 0438 121 001
- 0-438-121-001
- 0438121001
Mercedes-Benz Reference Number
A0000741214
Also written as:
- 0000741214
- A 000 074 12 14
- 000 074 12 14
Additional Reference
A1020740214 / 1020740214
Bosch Replacement / Exchange Number
0986439301
Also written as:
- 0 986 439 301
- 0986 439 301
Bosch Classic Replacement Number
F026TX2060
Part Type
KE-Jetronic Air Flow Meter / Airflow Sensor Assembly
Vehicle Fitment
Bosch catalogs this air-flow meter for select Mercedes-Benz applications including:
Mercedes-Benz 190E W201
190E 2.0
- Select 1982–1989 Mercedes-Benz 190E 2.0 applications
- M102 gasoline engine
190E 2.3
- Select 1984–1993 Mercedes-Benz 190E 2.3 applications
- M102 gasoline engine
Mercedes-Benz W124 Sedan
200E
- Select 1986–1992 Mercedes-Benz 200E
- 2.0L M102 gasoline engine
230E
- Select 1984–1993 Mercedes-Benz 230E
- 2.3L M102 gasoline engine
Mercedes-Benz C124 Coupe
200CE
- Select 1990–1993 Mercedes-Benz 200CE
- 2.0L M102 gasoline engine
230CE
- Select 1987–1992 Mercedes-Benz 230CE
- 2.3L M102 gasoline engine
Mercedes-Benz S124 Wagon
200TE
- Select 1988–1992 Mercedes-Benz 200TE
- 2.0L M102 gasoline engine
230TE
- Select 1985–1993 Mercedes-Benz 230TE
- 2.3L M102 gasoline engine
Mercedes-Benz G-Class W460
230GE
- Select 1985–1989 Mercedes-Benz 230GE
- 2.3L M102 gasoline engine
Important Fitment Information
Mercedes-Benz and Bosch used several different KE-Jetronic air-flow meter assemblies depending on:
- Engine displacement
- Production date
- Emissions configuration
- Catalytic-converter equipment
- Vehicle market
- Fuel-distributor configuration
- Air-flow meter calibration
Some applications for 0438121001 are associated with European-market or non-catalyst M102 configurations.
Do not purchase based only on vehicle model or engine size.
Exact Bosch Number
0438121001
Exact part-number matching is strongly recommended.
Bosch KE-Jetronic System
The Bosch KE-Jetronic system combines mechanical continuous fuel injection with electronic mixture control.
The air-flow meter uses a moving sensor plate positioned in the intake-air stream.
As engine airflow increases, the sensor plate moves and mechanically influences the fuel-metering system.
The assembly works together with components including:
- Fuel distributor
- Air-flow sensor plate
- Air-flow potentiometer
- Electro-hydraulic actuator
- Fuel injectors
- Fuel pressure regulator
- Engine control electronics
- Throttle body
- Intake system
This listing is for the air-flow meter assembly identified by Bosch number 0438121001.
Air Flow Meter vs Fuel Distributor
This component is the air-flow meter / sensor plate assembly.
It should not be confused with the Bosch fuel distributor mounted as part of the KE-Jetronic fuel-metering system.
The fuel distributor and air-flow meter work together but carry separate Bosch identification numbers.
Always verify the number stamped or labeled on the component being replaced.
Common Failure Symptoms
A worn or malfunctioning KE-Jetronic air-flow meter may be associated with symptoms including:
- Rough idle
- Unstable idle
- Hard starting
- Hesitation during acceleration
- Poor throttle response
- Engine stalling
- Rich fuel mixture
- Lean fuel mixture
- Excessive fuel consumption
- Uneven engine operation
- Incorrect air/fuel mixture
- Poor warm-engine operation
- Sensor plate sticking or binding
These symptoms can also be caused by other KE-Jetronic components, vacuum leaks, fuel-pressure problems, ignition faults or engine-management issues.
Proper diagnosis is recommended before replacement.
Air-Flow Sensor Plate
The sensor plate should move smoothly through its operating range without sticking or binding.
Correct sensor-plate movement is important for proper fuel metering.
The intake system and surrounding rubber components should also be inspected for:
- Air leaks
- Cracked intake boots
- Vacuum leaks
- Dirt or contamination
- Damaged seals
- Incorrect adjustment
Condition
Used Genuine OEM Bosch / Mercedes-Benz Part
This is an original previously installed classic automotive component.
Normal signs of previous use may include:
- Surface marks
- Light scratches
- Dust
- Discoloration
- Label wear
- Installation marks
- Minor oxidation
- Normal age-related cosmetic wear
Product photographs are representative of the overall style and condition of available inventory.
The unit shipped will be a matching Bosch 0438121001 unit in comparable used condition.
Part Number Verification
Please compare your original air-flow meter with:
Bosch 0438121001
0 438 121 001
Mercedes-Benz reference:
A0000741214
Bosch exchange/replacement reference:
0986439301
Bosch Classic reference:
F026TX2060
Also verify:
- Electrical connectors
- Sensor-plate housing
- Mounting configuration
- Engine type
- Vehicle production date
- Emissions configuration
Exact-number matching provides the safest method of confirming compatibility.
Installation
Professional installation by a technician familiar with Bosch KE-Jetronic fuel injection is recommended.
After replacement, the fuel-injection system may require inspection or adjustment of:
- Sensor-plate position
- Air/fuel mixture
- Idle mixture
- Fuel pressures
- Throttle adjustment
- Vacuum system
- KE-Jetronic electrical controls
Incorrect adjustment of a KE-Jetronic system can result in poor engine operation.
What Is Included
1 × Genuine Bosch KE-Jetronic Air Flow Meter Assembly
Part Number: 0438121001
Only the air-flow meter assembly and components specifically described with the product are included.
Fuel distributor, injectors, fuel lines, throttle body, hoses, air cleaner housing, mounting hardware and other fuel-injection components are not included unless specifically stated.
Warranty
Covered by the Oz’s Garage 30-Day Replacement Warranty.
Warranty does not cover damage caused by:
- Incorrect vehicle application
- Improper installation
- Incorrect fuel-system adjustment
- Contaminated fuel
- Fuel-system debris
- Vacuum leaks
- Modification
- Disassembly
- Tampering
- Physical damage after delivery
Labor, installation, diagnosis, adjustment, tuning and related vehicle expenses are not covered.
Shipping
The air-flow meter will be carefully packaged to help protect the:
- Sensor plate
- Housing
- Mechanical components
- Potentiometer
- Electrical connectors
- Mounting surfaces
during transportation.
Usually ships within 1–2 business days.
🌎 Worldwide shipping available.
International buyers are responsible for applicable customs duties, import taxes, brokerage charges and other local fees.
Why Buy From Oz’s Garage?
- Genuine OEM classic automotive parts
- Original Bosch fuel-injection components
- Hard-to-find and discontinued parts
- Mercedes-Benz classic vehicle parts
- 30-Day Replacement Warranty
- Worldwide shipping available
- Usually ships within 1–2 business days
