So, 2014 Equinox appears to be eating through O2 sensors and developed an idle/tip-in stall. I've replaced 3 O2 sensors in the last year, all factory GM parts.
It's an EcoTec, so of course it had a cracked exhaust manifold. I replaced that but it's still doing its tip-in stall. Code shows heater bank failure on a 4 month old sensor, multi-meter disagrees.
I'm starting to wonder if it's the ECM and I'm bracing myself for what it takes to replace it. I've heard of GM's ECMs being "VIN locked" to a specific key and that replacing the factory ECM with a junkyard unit or even a factory replacement is a pain (but not impossible). How bad will this be if it's an ECM?
