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