Mercedes-Benz W221 Accelerator Pedal A2203000104 - Used Original Parts
RM 300
Condition: Used (Original)Description
Product Title
Mercedes-Benz W221 Accelerator Pedal Assembly A2203000104 - Used Original Parts
Diagnosis and Common Symptoms
The accelerator pedal assembly on the W221 S-Class houses a dual-sensor potentiometer module that communicates directly with the ME/EZS engine control unit via a hardwired signal to interpret driver throttle input. When this module degrades due to internal wear, oxidation of the contact tracks, or a cracked sensor housing, the ECU typically flags fault codes such as P2138 (Throttle/Pedal Position Sensor Correlation), P0122/P0222 (Sensor Circuit Low Input), or P0123/P0223 (Sensor Circuit High Input). Drivers commonly report a sudden loss of acceleration response, the vehicle entering "limp mode" with power capped at idle-plus levels, an illuminated Check Engine light, or a "Malfunction - Visit Workshop" message on the instrument cluster. Intermittent hesitation, jerky throttle response at low speed, or a complete failure to register pedal input while the engine remains idling are all classic signs of this specific pedal assembly failing rather than a wiring fault further down the harness. Because the two internal sensors must agree within a tolerance the ECU monitors constantly, even minor internal drift can trigger a correlation fault well before total failure occurs.
Introduction
This is a Genuine Used Mercedes-Benz W221 Accelerator Pedal Assembly, part number A2203000104, sourced directly from a donor S-Class during dismantling and carefully inspected for sensor integrity. Each unit is bench Tested with a multimeter and signal simulator to confirm both potentiometer tracks output correctly and correlate within factory tolerance before listing. Buying original used means you get a factory-matched sensor curve the ECU already recognizes, avoiding the compatibility and calibration guesswork sometimes seen with aftermarket reproductions. This is a straightforward, plug-and-play replacement for W221 owners experiencing throttle response faults or correlation error codes.
Product Details
- Brand: Mercedes-Benz
- Model Compatibility: W221 S-Class (S350, S400, S450, S500, S550, S600, S63 AMG, S65 AMG - subject to part number match)
- Part Name: Accelerator Pedal Assembly (Electronic Throttle Pedal Sensor Module)
- Part Number: A2203000104
- Condition: Genuine Used (Tested Working)
- Notes: Sensor output verified with diagnostic tool prior to sale; connector pins and mounting bracket inspected for wear; recommend visual check of harness connector on your vehicle before install to rule out wiring-side faults.
Frequently Asked Questions
Q: Will my W221 need coding or adaptation after installing part A2203000104? A: No coding or adaptation is required. The pedal assembly is a passive sensor module read directly by the ECU, so once connected the engine control unit reads the new sensor signal immediately without any programming step.
Q: How do I confirm A2203000104 is the correct part number for my specific W221? A: Check the part number printed or laser-etched on the back of your existing pedal bracket, or cross-reference it against your VIN through Mercedes EPC data, since S-Class variants across model years used several revisions of this pedal assembly.
Q: What fault codes indicate this pedal assembly is failing on the W221? A: The most common codes are P2138, P0122, P0222, P0123, and P0223, all relating to throttle position sensor circuit faults or correlation mismatches between the pedal's dual sensors.
Q: Is a used pedal assembly reliable, or should I buy new for my S-Class? A: A genuine used unit from a low-mileage donor typically has significant remaining service life since these sensors rarely wear out from age alone, and each unit we supply is tested for correct signal output, making it a cost-effective and reliable alternative to a new dealer part in Malaysia.
Q: Are there any installation gotchas specific to the W221 pedal assembly? A: The main point to check is the connector orientation and locking clip condition, as a loose or partially seated connector on this pedal can mimic a sensor fault even when the part itself is functioning correctly.
Why Choose Us?
- Verified functionality
- Actual photos/videos provided
- 30-day exchange warranty
- Bench-tested sensor correlation ensures no post-install correlation fault codes
Shipping
Location: Kuala Lumpur, Malaysia Shipping: West Malaysia RM50 (Estimate) / East Malaysia RM80 (Estimate) Delivery: 1-2 working days Packaging: Secure anti-static packaging, heavy-duty shock absorption. (We send actual photos/videos of the unit and packaging before shipping)
Warranty and Return Policy
- 30-day exchange warranty from the date of receipt.
- Proof of professional installation by a qualified workshop is required for warranty claims.
- No returns if the item is opened, modified, tampered with, or damaged due to incorrect electrical wiring.
- Exchange only for confirmed internal electronic defects.
How to Order
- WhatsApp us to confirm compatibility with your specific VIN.
- Send your chassis number or a clear photo of your old unit label.
- Confirm order details and stock availability.
- Receive actual product photos and diagnostic test confirmation.
- Make payment via bank transfer.
- Item is shipped immediately with tracking details provided.
Contact Us
Ready to order or have questions? Tap the WhatsApp button to chat with our team directly.
Price Notice
Price is estimated only. Actual price depends on current stock levels, specific part number revisions, and unit condition. Please WhatsApp us for a formal quote.
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