Question about 1997 Chevrolet K1500

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O2 sensor problem

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!!!

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  • Anonymous Mar 11, 2009

    code 151 & 131 The truck doesnt start since the light came on. Before the light, the truck had a very hard time starting.

  • jfee May 13, 2009

    I have a 1997 chevy 5.7 k3500 and for awhile it has been stumbling at 45 mph and at 65 mph. One day my fuel pump went belly up and I replaced it with an oem part and it runs but the same stumbling and missing probs. I changed the plugs and wires and dist cap. Its really bad when its wet outside. Even after all this I got 2 o2 codes, sensor 1 and sensor 2 on bank 1 (drivers side) so the guy at auto zone said i could just change bank one sensor 1 instead of both bank one sensore because he said bank one snsor one controls also sensor 2 on that bank, so I did. Well, same problem, stumbling, acts like its missing especially when its raining or has been raining. I'm about to give the vehicle a date with the deep end of a boat ramp somewhere. Can anyone help? Thanks a bunch.

  • Anonymous Mar 17, 2014

    replaced o2, cat, and now all other codes are of but when i check with the obd2 tool to see if its ready for inspection the EV is still not ready

  • Anonymous Mar 22, 2014

    Engine shutting off while driving less than a mile. Will not start back up right away. Receiving a code po101. Replaced air mass flow sensor and drove for a couple days and problem is back again.



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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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The PO161 code tells you

Did you not google it, to learn what the
reason for the code was

Doesn't mean a sensor is bad,maybe,but you have
to do some testing

PO 161--Bank #2 Sensor #2

Bank #2 is the side opposite cylinder #1
& Sensor #2 is the one at the converter outlet

Need to study OBD2 Systems before you go
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The codes were cleared after the fix? If they were, then the light means it likely wasn't the sensor itself, but a short or open in the heater circuit to it, or the connector to the sensor is bad and needs repair.
The sensor in question is the Heated Oxygen Sensor (2), located rear of catalytic converter. That is the one you changed, right? Because your car has two O2 sensors, one nearer engine in the exhaust, and this one in back of the catalytic converter. Since you already changed the sensor, here are the remaining fixes for that code: heater power or ground circuit open or shorted, or 2) sensor's connector is bad (maybe damaged from oil contamination).
If car runs good now even with light on, then it's not a huge issue. Driveability won't be affected by that code-just the nuisance of the light staying on. Might just check the sensor's connector. Pull it apart, maybe you'll see the problem. If not the connector, a mechanioc will have to trace the circuit to find the short or open. It's (again) the heater circuit to sensor. Good luck.

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^ Vacuum leak around the MAP sensor grommet.
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^ Restricted exhaust or air intake.
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