The oxygen sensor switches back and forth from low voltage lean to high voltage rich. How does a mechanic diagnose the P0157 code? Use a breaker bar to remove the sensor if needed. There are other things that cause P0157 to populate. Check engine light came back to mock me again. Reassemble the cylinder heads using new valve seals. If scan tool indicates that this test ran and passed, go to next step.
If not what else could cause this? Check for intermittent ground in wire between connector and sensor. Oxygen sensor 2 is the downstream oxygen sensor in relationship to the. Is this just a fluke that both of these came on at the same time or could it be something else instead of the two oxygen sensors at once? The O2 sensor switches back and forth from lean to rich fast. Proper fuel pressure should be at 40 psi. I was getting intermittent P0156 and P0157 codes, I visually checked the wiring, didn't see anything obvious. They are presented in order somewhat of most to least likely to cause the problem. It's important to check the connections, terminals along with the wire condition, in the entire circuit.
The truck ran fine until I took a 800 mile trip. This is because the converter can only let a fraction of the amount of exhaust through that it normally can. As far as any other electrical issues goes, every now and then the rear power windows do not function. Warm engine to normal operating temperature. I have never had any of the codes with my truck until i did the frame and this was the place i ended up hitting on accident.
Ever had either of these two codes before the repair? Where do they ground to? For more information, refer to fuel supply system. The numbers below refer to the step numbers on the diagnostic table. I have a 2004 Chevy Tahoe with the 5. I found a deal on some and was going to swap out all four for new ones as a preventive maintenance. This means the signal voltage Bank 2 Sensor 2 of the O2 sensor is below normal.
They are relatively affordable at Autozone or. Check for water near in-tank fuel pump inlet that may be delivered to injectors. Recently I got an error code of P0161, O2 heater circuit. If scan tool does not indicate that this test ran and passed, go to step 2. A hole in the converter? I do not get any other codes with my scantool except for these.
For optimum catalyst operation, the air fuel mixture air-fuel ratio must be maintained near the ideal stoichiometric ratio. There's 4 wires on the O2, so it should be easy to repair. You may need a breaker bar for extra leverage. The code still came up. Is the Misfire Index increasing for more than one cylinder? O2 sensor bank 1 sensor one is the sensor before the convertor on the driver side of the engine. I just bought a 2000 Silverado with a 4.
It has a tiny surge while idling, but not enough to show on the tachometer. Did you solve this problem? Then, check the pressure of the fuel through the pressure gauge. By keeping this mixture balanced, the computer prevents the engine from running too lean or too rich. Fuel System Diagnosis must be performed in order to determine the cause of the problem. As long as you are getting ground and. If a spark is visible, replace the wires. In order to confirm, monitor a fuel pressure while driving the vehicle at various speeds and loads.
P0137 Oxygen Sensor Circuit Low Voltage Bank 1, Sensor 2 P0138 Oxygen Sensor Circuit High Voltage Bank 1, Sensor 2 P0157 Oxygen Sensor Circuit Low Voltage Bank 2, Sensor 2 P0158 Oxygen Sensor Circuit High Voltage Bank 2, Sensor 2 From these codes I'm going to say it's not the sensors themselves. Check your battery and make sure positive and ground are tight. Check the rear O2 sensor wires for breaks, shorts and exposed wires. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. Common Symptoms Check Engine light is the most obvious symptom for Error Code P0157.
Unscrew and remove the O2 sensor. If voltage is not as specified, go to next step. Could this have something to do with the converters? An will make it easier to reach an oxygen sensor that is positioned awkwardly, and a is used as a heating element to assist in the removal. So what you guys are saying is I can completely rule out it being the two rear oxygen sensors? Chevrolet Silverado 1999-2006: How to Replace Oxygen O2 Sensors If your Chevy Silverado is racking up miles, you might notice a significant decrease in fuel economy and engine power. Please follow this diagnosis process thoroughly and complete each step. A lean mixture of oxygen and gas means that there is too much oxygen in the exhaust.
Check for intermittent ground in wire between connector and sensor. Which 90% of the time it is an upper intake gasket. I replaced the corresponding sensor in Bank 2, Sensor 2. Is the check engine light on in your Silverado? Thanks for any feed back. What causes the P0157 code? Replaced the cat a few months ago 97 Sierra and the old one was empty,all the catalyst went into the muffler the mech said. Good luck and keep us posted on your progress. A rich mixture of oxygen and gas means that there is not enough oxygen in the exhaust.