Q: Truck fired up good yesterday & now its won't start up but cranks. 2000 GMC Yukon

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The fuel pressure is good, compression is good, spark plugs are about a year old, did my tune up about 4 months agoo, I had to turn it on with starter fluid yesterday Left it on for about 30 mins then I let the truck sit for about 2 hours came back to it & it wouldnt start! Neither when I sprayed starter fluid,

I got 1 code p0155 wicht is heated circuit bank 2 sensor 1,

Any tips would be help full, Thanks.

My car has 225000 miles.
My car has an automatic transmission.

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