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Pelican Technical Article:

Main Relay Replacement

Jared Fenton

Time:

10 minutes10 mins

Tab:

$45

Talent:

**

Tools:

Your hands

Applicable Models:

Jetta MkIV 2.0L (1998-05)

Parts Required:

Main relay

Hot Tip:

Check all connections in engine bay

Performance Gain:

Engine runs again

Complementary Modification:

Engine tune up

The fuel injection main relay is a common source of troubles. Over time, the function of the relay can become intermittent, usually due to temperature. The good news is that replacement is easy and should take no more than 10 minutes. A failing main relay can cause all sorts of odd problems. It's also easy to check operation by popping a known good relay in its place.

I recommend disconnecting the ground from the battery during replacement for safety. See our article on battery replacement for more information.

The main relay is located in the relay box on the right side of the firewall, next to the brake fluid reservoir.
Figure 1

The main relay is located in the relay box on the right side of the firewall, next to the brake fluid reservoir. Pull the cover (green arrow) off the relay box.

Underneath the cover is the main relay (green arrow).
Figure 2

Underneath the cover is the main relay (green arrow). Pull the relay out of the socket and replace it with the new relay. And that's it, you're finished. Place the cover back on the relay box, and reconnect the battery.

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Page last updated: Fri 12/9/2016 03:06:02 AM