So I looked up the TPMS sensor OEM part number for my 2007 GMC and found (without any surprise) that the same sensor is used on nearly all GM’s trucks and SUVs of that era: Cadillac Escalade, GMC Yukon, Chevy Suburban and Tahoe, etc. The OEM sensor (made by AC Delco) had an MSRP of $72.44. Local auto parts stores sold decent quality non-OEM replacements that were compatible with my vehicle for between $52 – $62 each. Alright. Now we’re getting warmer.

But to my surprise, I found these AC Delco OEM TPMS sensors for my GMC Yukon — the exact same ones the dealer would have installed — on Amazon.com for $27.29 ea (including free shipping). So for $109.16, I had all four sensors in my hands within 2 days. I was concerned that maybe they’d be used, or somehow not as advertised. But they arrived brand new, in two days, in the original packaging: