1990-1995 Audi 90 X-Contact Relay: A Guide to Replacement and Symptoms
Is your Audi 90 experiencing strange electrical issues? Your X-Contact Relay might be the culprit.
- A failing X-Contact Relay causes multiple electrical items like headlights, wipers, and the heater fan to stop working at once.
- The relay is located in the main fuse box under the hood and is a very simple part to replace yourself.
- Before buying, check the number on your old relay to ensure you order the correct replacement.
- Choosing a quality aftermarket brand like CRP or Standard Ignition may provide better long-term reliability than the cheapest options.
Understanding X-Contact Relay Failure
When the X-Contact relay begins to fail, it can cause a variety of confusing electrical problems in your 1990-1995 Audi 90. Because it controls several unrelated systems, owners might suspect a more serious issue. However, these electrical gremlins often point back to this single, simple component. Symptoms can appear suddenly and may be intermittent at first, making diagnosis tricky. A common cause of failure is simply age; the internal contacts can wear out or corrode after decades of use.
Symptoms of a Failing X-Contact Relay
A bad X-Contact Relay can make your car seem possessed. The most common sign is that multiple electrical accessories stop working at the same time. You might find that your headlights, wipers, radio, and heater fan all die simultaneously. In other cases, these accessories might work intermittently or not at all. Because the relay's job is to reduce the load on the ignition switch, its failure can sometimes mimic a bad ignition switch. If you're losing power to multiple systems that should work when the key is on, the X-Contact Relay is a primary suspect.
Verify Your Part Number
Before ordering, it is highly recommended to check the part number printed on your old relay. Some models may have different relay specifications. The X-Contact relay is often marked with a specific number, such as '100' or '370', and is typically a 50-amp relay. This ensures you get the correct replacement part.
Choosing the Right Aftermarket Relay
For a vehicle like the 1990-1995 Audi 90, aftermarket parts are often the only practical option. Several brands offer replacements, but quality can vary. It's important to choose a reliable brand to avoid premature failure and more headaches down the road.
| Brand Tier | Brand(s) | Our Price Range | Quality & Notes |
|---|---|---|---|
| Good | CRP (Rein), Standard Ignition | $7.85 - $34.75 | CRP, often sold under the Rein brand, is a well-regarded aftermarket manufacturer that sometimes supplies OEM parts. Standard Motor Products (Standard Ignition) is a long-standing brand known for producing reliable ignition and electrical components. These brands are a solid choice for durability. |
| Economy | URO Parts | $7.85 - $9.44 | URO Parts provides a budget-friendly alternative. While they can be a viable option if cost is the primary concern, some user reviews across various car communities suggest their parts can have a higher failure rate or inconsistent quality compared to premium aftermarket brands. For a critical electrical component, it may be worth spending a few extra dollars for a more established brand. |
Installation Tip
The X-Contact Relay is located in the main fuse and relay panel in the engine compartment, near the base of the windshield on the driver's side. It is typically in position 5 or 6. Replacement is simple: disconnect the battery, remove the cover, pull the old relay straight out, and plug the new one in. No special tools are required.
Frequently Asked Questions
Where is the X-Contact Relay located on my Audi 90?
The X-Contact Relay is in the main fuse and relay box. This box is found under the hood, on the driver's side, close to the windshield. It is usually in position #5 or #6. Check the diagram on the fuse box cover to be certain.
Can I replace the X-Contact Relay myself?
Yes, this is a very easy DIY job. It requires no special tools and can be completed in minutes. Simply locate the relay, pull the old one out, and push the new one in. It's a good idea to disconnect the battery first as a safety precaution.
What happens if I don't replace a failing X-Contact Relay?
You will continue to experience intermittent or total failure of important electrical systems like headlights, wipers, and your heater blower. While the car may still run, losing these functions can be a serious safety issue, especially if they fail while you are driving.
Are there any recalls for the Audi 90 X-Contact Relay?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database did not find any recalls or technical service bulletins (TSBs) specifically related to the X-Contact Relay for the 1990-1995 Audi 90.
Technical Specifications
OEM Part Numbers: 4H0951253A
Typically a 50 Amp, 4 or 5-pin relay. Often located in position #5 or #6 in the main relay panel.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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