2Q0907561 Radar Sensor Genuine OEM ACC Front Radar Control Unit for VW Polo T-Roc Audi Skoda SEAT

About this part

The 2Q0907561 radar sensor is the brand new genuine OEM front distance radar control unit for Volkswagen Group MQB and MQB A0 cars fitted with Adaptive Cruise Control, Front Assist and automatic emergency braking. The housing label reads 2Q0 907 561 with index 0233, hardware reference 2Q0 907 572 B H03 and the TF9 plant code, followed by FRONTRADARSTEUERGERAET, MADE IN CHINA, the VW AG logo and the type approval code A2.C763-2370.1. The manufacturer line still names ADC Automotive Distance Control Systems GmbH of Peter-Dornier-Strasse 10, Lindau, Germany — the Continental subsidiary that designs the ARS4-B platform — even though this particular unit was assembled in China. It is the H03 hardware revision, the latest of the three revisions in this sensor family, and it sits centrally behind the front bumper measuring the range, azimuth and closing speed of targets ahead. Supplied as one brand new, unused sensor.

radar sensor — genuine 2Q0907561 front ACC radar control unit on the Continental ARS4-B platform, assembled in China with the later 2Q0 907 572 B H03 hardware revision; the base number of the 2Q0 907 561 family that replaced the 2Q0907572 series.

OE/OEM Part Number:

2Q0907561, 2Q0907561C, 2Q0907561H, 2Q0907561J, 2Q0907561K, 2Q0907561L, 2Q0907561M, 2Q0907572M, 2Q0907572J

Continental / ADC: ARS4-B, 2Q0 907 572 B H03

Reading the label correctly

Why a 561 number says 572 on the hardware line. This is the single most confusing thing about this sensor and the reason so many buyers order the wrong part. Volkswagen renumbered the front radar family from 2Q0 907 572 to 2Q0 907 561 when it moved to the 561 series, but the underlying ARS4-B electronic hardware platform stayed the same. The part number on the first line of the label is 2Q0 907 561; the hardware reference two lines below is 2Q0 907 572 B followed by the revision H03. Both strings are correct and both belong to the same unit. Compare the whole label with your original sensor, not just one number.

What the H03 revision means. The German-built 2Q0907572J carries H01 and the later German-built 2Q0907572M carries H02. This Chinese-built 2Q0907561 carries H03, the newest hardware step, with a correspondingly later software dataset and the TF9 plant code. On cars originally delivered with an H03 unit, an H03 replacement keeps the gateway, ABS and instrument cluster coding exactly as validated at the factory. Dropping an earlier H01 or H02 sensor into an H03 car can leave the coding routine refusing to complete, so always match the hardware index as well as the part number.

Function, supersession and the difference from the 572 series

One radar, three safety functions. The ARS4-B is a 76 to 77 GHz FMCW unit with a wide short-range field of roughly 55 metres at plus or minus 45 degrees and a narrow long-range beam out to about 120 metres at plus or minus 9 degrees. It scans about fifteen times a second and publishes a multi-target list over CAN. Adaptive Cruise Control uses that list to hold the set gap, Front Assist uses it to warn and pre-charge the brakes, and autonomous emergency braking uses it to stop the car if the driver does not react. Radar keeps working in rain, fog, darkness and low sun where a camera struggles, so a fault in this one module normally takes the entire driver assist stack offline.

Supersession chain. VW ran the older family through 2Q0907572E, G, H, J and M, then renumbered it to the 2Q0 907 561 series with suffixes C, H, J, K, L and M. The current catalogue numbers quoted by dealers are 2Q0907561K and 2Q0907561M. This base 2Q0 907 561 unit belongs to that later group. Because a used sensor from a breaker can still be flashed to an older or vehicle-specific software index, a brand new unit avoids the mismatched-firmware problem that so often stops coding halfway through.

Not interchangeable with 2Q0907550D. That unit is the USA-built 2Q0 907 550 family with hardware 2Q0 907 819 H04. Both say ARS4-B and look almost identical, but the VW number, hardware reference, country of origin and internal dataset are different. The same caution applies to the older German-built 2Q0907572J and 2Q0907572M: they share the platform but not the hardware revision. Read the number and the H-index printed on the original sensor before ordering.

PR codes decide the function set. Cars built with PR code 6K2 have Front Assist with autonomous emergency braking but no full ACC; 6K3 adds ACC with stop-and-go. The radar hardware is shared, while the enabled functions belong to the car’s coding. Fitting this sensor will not add ACC to a 6K2 car without the proper retrofit, harness, controls and coding. There is no left or right hand variant — one centrally mounted module serves all positions.

Symptoms, diagnosis and installation

Typical symptoms. ACC unavailable or cutting out on the motorway, a Front Assist warning that will not clear, driver assist systems reported as restricted at start-up, sudden braking with nothing ahead, or a scan showing no communication, internal fault, misalignment or calibration not performed on the front radar module. The sensor sits low in the bumper on a plastic bracket, so a parking impact, a kerb strike or a careless bumper removal can crack the mount or push the beam off axis. Water entering a damaged housing or a wet seven-pin connector corrodes the terminals and causes intermittent faults. Metallic flake paint, chrome wrap or metalised film over the radar window attenuates the signal and produces phantom targets. Check the bracket, wiring and bumper surface before condemning the electronics.

Fitting and calibration. Mount the unit in the correct front bracket orientation, seat the seven-pin plug until it clicks and make sure the bumper cover in front of the radar is clean and free of metallic film or heavy paint. This is a coded module: use ODIS, VCDS or an equivalent VW Group capable tool to confirm the module is visible on the CAN bus, run the radar alignment routine with the specified target plate and distance, clear all stored faults and road test the distance regulation. Without coding and calibration ACC stays inactive and the dash warning returns. Calibration and coding charges belong to the fitting workshop and are not covered by the parts warranty.

Physical specification. ARS4-B 76 to 77 GHz FMCW radar, approximately 92 by 68 by 30 mm, around 0.4 kg, seven-pin CAN connector, sealed black housing with four mounting bosses and moulded cooling ribs. Approvals printed on this unit include FCC ID OAYARS4B, IC 4135A-ARS4B, CMIIT ID 2014DJ6494, ANATEL 4057-14-6068, KC 202-LSE009 and CE 03482. Two DataMatrix codes on the label carry the serial and production data; quote them if you need us to confirm a match. Send us the VIN if in doubt.

Fitment

The 561 series covers both the small MQB A0 cars and the larger MQB models, but fitment is gated by the factory PR code, the front bumper bracket geometry and the number on the original sensor. Commercial vehicles in particular use different bumper mounting. Use this table as a guide and check the part number on your old unit, or send us the VIN, before ordering:

Shipping and packing

Orders leave within one to two working days of cleared payment, packed in a foam-lined box with the connector and the radar face protected so the housing seal, the four mounting bosses and the plug arrive undamaged. Tracking is emailed when the parcel is handed to the carrier. Customs charges, where they apply, are the buyer’s responsibility.

Condition & warranty

Brand new genuine quality 2Q0907561 radar sensor, twelve months warranty against manufacturing defects covering the unit as supplied. The warranty does not cover impact damage, water ingress through a damaged housing or connector, calibration and coding costs, or a unit fitted without the required alignment procedure. If a part arrives faulty, send us photos and the fault scan before returning anything.

Wholesale

Tiered pricing for 1 pc, 5 pcs and 20 pcs is shown below. Bodyshops and resellers doing front-end and ADAS repairs should ask for a combined quote — we price mixed orders of radar sensors, mounting brackets, grille badges and ACC stalks together. Because the H01, H02 and H03 revisions are not freely interchangeable, workshops that service several model years often stock one of each so the replacement always matches the hardware index on the original label.