The instructions do say to crimp rather than solder, but that has never quite made sense to me. I have always bought OEM so I never had to face that decision.
I have never bought at Walker. I used to use Bosch, but have switched to Denso for my most recent replacements. Actually, the box does not say Denso. It is a subsidiary of Denso.
My 91 drove me nuts a year or so ago with an intermittant power feed to the oxygen sensor heater. Always worked when I checked it. Took forever to find the problem. I ended up running a new wire from the fuse box to the sensor plug. No more problems.
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