M.R Traders

AC Pressure Switch Sensor 4H0959126 For Audi A6/ Volkswagen

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  • Vendor M.R Traders
  • SKU 5

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AC Pressure Switch Sensor 4H0959126 For Audi A6

Part Description & Function

  • The 4H0959126 is an air conditioning (A/C) refrigerant pressure sensor / switch (sometimes called an HVAC pressure sender or cut-out switch).
  • It monitors the refrigerant pressure in the A/C system and signals to the control module whether pressure is within safe limits. If pressure is too low or too high, the switch can disable the compressor to prevent damage.
  • Essentially, it acts as a safety / feedback device to ensure proper system operation and protect against overpressure or underpressure conditions.

Fitment / Applications (Which Vehicles It Fits)

The 4H0959126 (and its variants) is used on various Audi (and related VW / VW-group) models. Some known fitments:

Model / Application

Notes / Additional Part Numbers

Audi A6

Several model years, especially later generations.

Audi A3, A4, A5, A7, A8, Q5, etc.

Many listings show compatibility across Audi models: “2008-2016 Audi A3, A4, A5, A6, A7, A8, Q5”

VW / other VW-group vehicles

Some compatibility with VW / Porsche / related models is also cited.

When ordering or confirming fitment, it's essential to verify with VIN or the existing part number, since there are variant suffixes (A, B, C) that may differ slightly.

One example: the OEM listing for Audi’s parts site shows 4H0959126C as the “Pressure Sensor (A/C Refrigerant) / HVAC Sender / Switch” for certain A6 variants.

Alternate / Interchange Part Numbers & Variants

Because the base number “4H0959126” has suffix variants, here are known alternates, compatible OEM variants, and interchange numbers:

  • 4H0959126A
  • 4H0959126B
  • 4H0959126C (commonly cited as current OEM in many catalogs)
  • Also cited: 5Q0959126B
  • Sometimes “4H0-959-126” is used (same core number, with or without suffix)
  • In OE supplier listings, they list alternates like 4F0959126A/B/C, 8K0959126, 8K0959126A/B as interchange possibilities depending on model.

Be careful: suffix (A/B/C) may affect connector style, pressure thresholds, or compatibility, so don’t assume one is always interchangeable without verifying.

What to Check / When Replacing

  • Connector / plug type & pin layout — Ensure the wiring harness matches (e.g. 2-pin, 3-pin).
  • Pressure thresholds / calibration — Some suffix versions may have different pressure switch points (cut-in / cut-out).
  • Physical mounting / thread — The sensor screws into a port in the A/C line or accumulator/drier. The thread and sealing must match (often with O-ring).
  • OEM vs aftermarket — Many aftermarket suppliers offer “replacement 4H0959126B / 4H0959126C” units.
  • Part verification by VIN — Because of variants, using the vehicle’s VIN to confirm the exact suffix version is safer. Many parts suppliers request VIN.