Mercedes PDC Sensor Part Numbers: A0009055504 vs A0009055604 and Why It Matters
Why this is confusing in the first place
Mercedes ultrasonic parking sensors look the same. Same rough size, same matte black housing, same three-pin connector, same retainer ring. Put four different part numbers on a bench and most people could not tell you which is which.
They are not interchangeable, and Mercedes did not even use a single part number across one bumper. This is the single most common reason parking sensors get ordered, fitted, and returned.
The one that trips everyone up: A0009055504 vs A0009055604
These two differ by one digit and are fitted to the same cars. They are not alternatives to each other — they are different positions on the same vehicle.
| Position | Part number |
|---|---|
| Rear bumper — all positions | A0009055504 |
| Front bumper — inner positions | A0009055504 |
| Front bumper — outer left and right | A0009055604 |
On a twelve-sensor car that works out to ten of the A0009055504 and two of the A0009055604. This is why genuine Mercedes bumper sets are sold as a mixed kit rather than twelve of one part, and it is why a "12-pack" of a single part number will not do a complete front-and-rear refresh on most cars.
If you are only doing the rear bumper, none of this matters — the rear is all A0009055504.
What A0009055504 fits
Documented across the following chassis. Build date and options package still determine how many your particular car left the factory with.
- A-Class — W176
- B-Class — W246
- C-Class — W205, S205, C205, A205
- CLA — C117, X117
- CLS — W218, C218, X218
- E-Class — W212, S212
- E-Class — W213, S213
- E-Class Coupe and Cabriolet — W207, C207, A207
- GLA — X156
- GLC — X253, C253
- ML and GLE — W166, X166
- GLE Coupe — C292
- S-Class — W222, V222, X222
- S-Class Coupe and Cabriolet — C217, A217
- SL — R231
- V-Class and Vito — W447, W448
- AMG GT
It also supersedes the earlier 0009055211 and 000905521105, and is frequently written without the A prefix as 0009055504.
The other numbers you will run into
A2125420018
An earlier-generation sensor covering a lot of the pre-facelift W212 era and the W176 A-Class, among others. Also listed under the Bosch reference 0263009638. Physically similar, not a substitute.
A2215420417
Older still. Turns up on the W164, W204, W211, W221 and R230 generations. If your car is from roughly the mid-2000s to early 2010s, this is the family to check first rather than the A0009055504.
A2239054000
The newer approach, and a genuine change in how Mercedes supplies these. Rather than shipping unpainted and expecting the body shop to colour-match, this sensor is ordered pre-finished in the car's paint code — Polar White 9149, Obsidian Black 9197, Iridium Silver 9775, Selenite Grey 7992, and so on. If your parts lookup is returning a colour code alongside the number, you are in this family.
How to identify yours in two minutes
Do not order from your model name. Do one of these instead.
- Read the sensor. The part number is moulded into the body. Getting one out usually means going in behind the bumper, but if you are replacing it you are going there anyway.
- Use your VIN. Any Mercedes parts counter, or any specialist worth buying from, can pull the exact number your car was built with. It takes them under a minute.
- Check the connector. A useful cross-check rather than a definitive answer — the A0009055504 family uses a three-pin connector. If yours has a different pin count you are looking at a different family entirely.
Two things that will ruin a correct part
Paint thickness. These are supplied unpainted and Mercedes specifies painting before installation, but the coat has to stay thin — under roughly 120 microns of total film. The sensor transmits through its own face, and a heavy build damps the signal until it reads short or stops answering the module. Plenty of "faulty" sensors are simply over-painted ones.
Cheap sensors that pass a visual and fail a self-test. The Parktronic module tests each sensor's actual response characteristics, not just whether something is electrically present. A sensor that looks right, plugs in, and still leaves the fault stored is a common outcome with the very cheapest listings. If you have fitted a new sensor and the fault has not cleared, the sensor itself is the first thing to doubt.
Getting it right the first time
We are a Mercedes-only shop, and we will confirm your part number against your VIN before you order — whether that ends up being a part we stock or not. If your car takes the A0009055504 we have it in singles for one known-bad sensor, and in 4, 6 and 12-packs for doing a bumper or a whole car at once. Free shipping, one-year warranty, thirty-day returns on anything unpainted and uninstalled.
Mercedes Parktronic PDC sensors — singles and multipacks →
Need the A0009055604 front outers, or one of the older families? Message us with your VIN and we will source them.