Question about 1997 Chevrolet K1500
OBD2 reader code P0161. Changed No.2 (right side) rear O2 sensor drove 150 miles. light back on. Same code. Changed again drove 32 mi. light on same code. Sensor is NTK. Engine is 1997 Chevy 350 cid, auto 4X4 Z71 119000 mi. HELP!!!
I have a 97 gmc sierra .This truck is the same as the chevy ok.Its a 350 5.7 liter 4x4 Z71.I took it to auto zone which was my first mistake.They put it the scanner and said bad O2 sensor.Ok so which one is it i said.They dont know.Well there four (4) O2 sensors in this truck i hope you know that.I had to replace all four of them before i had to take it to a real shop.It seems the fuel pump i replaced a week earlier with an auto zone fuel pump was bad.Ive changed my feul pump 4 times now and have 235000 miles on still running.You need to get your fuel pressure checked.It should be 65 psi to start it and 55 psi to run it.If the pressures are good it could be a different O2 sensor or maybe the mass air flow senor.My last option would be the fuel pressure regulator because it seems to be a waste of time and money.I would get that fuel pressue checked first.Good luck.
Posted on Nov 25, 2008
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Posted on Jan 02, 2017
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