[1.2gees]

Let the exaust cool down, spray some wd-40, and have the right size wrench, and it'll come off, my 16 year old (136k miles) came off with no problem, I presume yours can't really be any worse... Disconnect the sensor BEFORE all the bolts/hangers are off the manifold, also if your downpipe is anything like mine, you want to screw it in AFTER the hangers are on, but BEFORE you bolt up the front of the manifold.
Good luck,
Ahmet

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It's all the driver...