I've had it fail a couple times in the last 10yrs. Always have one on hand. It has to be the Bosch LSU4 they sell because others don't work in the HP realm, unless you want to get the NGK for twice that amount. At least that's what I've been told. The Sniper and Terminator X are different. All good though, at least I can get it running quick. Good thing I have my LCD screen with optional tunes installed to get me going. I had to talk a buddy of mine through what to do when he got stranded on the road once.

Holley EFI to Bosch 02 wideband adapter
Adapter harness for converting the Holley EFI harness to use a Bosch wideband sensor. This is a plug and play adapter.

This is what I used. Maybe it’s the I’m wrong about 4.2 vs 4.9.. I do recall stressing over which sensor to buy.
