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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Re: O2 sensor problem
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.
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i have replaced an O2 sensor and had similar failure after 1500 miles.
I removed it, chkd it, reinstalled it and it ran fine.
P0133 is related to slow response of O2 sensor. P1134 is mfg specific so google that for ur car.
Error Code: P0154 Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected Problem areas:
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).
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.
P0141=O2 Sensor Heater Circuit Bank 1 Sensor 2 P0161=O2 Sensor Heater Circuit Bank 2 Sensor 2, the 141 code is a problem with the heated O2 sensor on the drivers side exhaust after the converter, the 161 code is the same except it is on that passenger side exhaust after the converter.
o2 sensors are located on the exhaust pipes
1-2 before the cataltic converters and 1-2 after the cat. converters. 4 cyl engine has 1 before and 1 after. 6 and 8 have 2 before and after mostly) to determine if they are bad it is best left to a repair facility to run a computer diagnostic test routine and or emissions system tests.
The following are malfunctions that could cause a rich condition:
^ Fuel pressure too high. Perform fuel pressure test.
^ Leaking fuel injector(s). - Perform pressure leak down test.
^ Vacuum leak around the MAP sensor grommet.
^ Oxygen sensor contamination.
^ Restricted exhaust or air intake.
^ Fuel Vapor Canister saturated with fuel.
IMPORTANT: If the front oxygen reading voltage is above 600 mV and the rear HO2S is above 600 mV all the time, the O2 sensors are probably not
P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) check the wiring to the bank 2 sensor, that is the one behind the catalytic converter on the opposite side from the bank where #1 cylinder is located, see firing order diagram below.