A small relay can create a large diagnostic mess when the replacement is chosen by shape alone. The housing may look familiar, but a buyer still needs to confirm the part number, pin count, contact rating, coil suppression, and whether the mounting style matches the vehicle or equipment.

Bosch 0986332402 is a useful example because it is a 5-pin, 12 V changeover mini relay with a diode. It also appears in Bosch relay data as the successor reference for 0332209158, making it a practical part-number match question rather than a generic relay-shopping decision.

What Parts Universe lists

Parts Universe currently lists this item as BOSCH 0986332402 Changeover Mini Relay, Diode, 5 Pins, 12 V, 20/30 A. The active Shopify product record verified for this article shows:

  • Parts Universe SKU: BSH-0986332402
  • UPC: 4047024887020
  • Current Parts Universe price: $5.99
  • Current inventory: 202 units
  • Current inventory policy: CONTINUE
  • Current status: active and available for sale

What Bosch verifies

Bosch I-Business describes Bosch relays as a range of 12 V and 24 V relays for mobile and stationary applications. In Bosch's mini-relay table, part number 0986332402 is listed with predecessor 0332209158, current rating 30/20 A, 5 pins, diode coil connection, a mounting bracket, and 150,000 lifetime cycles.

Bosch Mobility Aftermarket also frames mini relays around vehicle electrical jobs such as fuel pumps, direction indicators, horns, all-round beacons, and headlights. That application list is a category guide, not a fitment promise for every vehicle.

When this relay is a good candidate

  • The original relay or service information calls for Bosch 0986332402.
  • The old relay is marked 0332209158 and Bosch replacement data points to 0986332402.
  • You need a 5-pin 12 V changeover mini relay with diode coil suppression, not a 4-pin normally-open relay or a relay with different coil protection.
  • The socket, terminal layout, and mounting bracket match the relay location you are servicing.

What to check before ordering

Do not use amperage and pin count as the only decision. For relay replacement, check the relay diagram on the case, the terminal numbers, the service manual, and the connector cavity. A diode relay can be polarity-sensitive, so installing a different coil-suppression style can create diagnostic faults or circuit damage.

If the old relay is stuck, Bosch's relay-change guidance says to disconnect the battery to prevent discharge and short circuits, then carefully loosen the relay. Bosch also recommends a function test by cross-swapping with an identical relay. Identical is the important word: cross-swap only when the rating, pin layout, and relay function match.

How this differs from a 100A power relay

Parts Universe recently covered Bosch 0332002159, a 100A normally-open power relay. Bosch 0986332402 is a different buyer problem: it is a compact 5-pin changeover mini relay rated 30/20 A with diode suppression. Do not substitute between those categories just because both are Bosch relays.

Practical safety notes

  • Disconnect the battery before relay removal when the service procedure calls for it.
  • Do not bypass a relay socket with wire or tools to "test" a circuit unless the service information explicitly supports that method.
  • If a replacement relay fails immediately, find the short circuit, overload, water intrusion, or terminal damage before installing another relay.
  • Keep relay replacement within the vehicle manufacturer's service information and warranty requirements.

Related Parts Universe links

For buyers, the main takeaway is simple: Bosch 0986332402 is not just "a 5-pin relay." It is the documented Bosch successor path for 0332209158 with a diode coil connection and 30/20 A changeover-mini-relay specs, so match those details before buying or swapping.