Code P0154

Tiny
IGENIUS92
  • MEMBER
  • 1997 CHEVROLET CAMARO
  • 3.8L
  • V6
  • 2WD
  • MANUAL
  • 154,000 MILES
Hello, I have the car listed above with a manual 5 speed transmission. Today my check engine light came on with a code p0154. I looked it up and I want to find bank 1 sensor 2 o2 sensor to see if that would fix the issue. And maybe some more advice on how to fix this problem. It cut off on me twice at low idle, started right back up. But I want to fix this issue ASAP. Is there a map of where that sensor is for this code and or maybe some advice?
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Wednesday, September 2nd, 2020 AT 9:17 PM

20 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

I attached the flow chart for the code, a picture of the location for you as well of the sensor.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

This will not cause the car to stall. That is a different issue. The most common cause is a dirty throttle body.

https://www.2carpros.com/articles/stall-at-idle

I attached a guide for you to clean it up and see if that makes a difference.

https://www.2carpros.com/articles/throttle-actuator-service

Roy

CIRCUIT DESCRIPTION

The PCM supplies a bias voltage of about 450mV between the HO2S signal and low circuits. When measured with a 10 megohm digital voltmeter, this may display as low as 320mV. The oxygen sensor varies the voltage within a range of about 1000mV when the exhaust is rich, down through about 10mV when exhaust is lean. The PCM constantly monitors the HO2S signal during closed loop operation and compensates for a rich or lean condition by decreasing or increasing injector pulse width as necessary. If the Bank 2 HO2S 1 voltage remains at or near the 450mV bias for an extended period of time, DTC P0154 will be set, indicating an open sensor signal or sensor low circuit.

CONDITIONS FOR SETTING THE DTC

No active transmission, Throttle Position (TP) sensor, EVAP system, EGR, misfire, IAT sensor, MAP sensor, fuel trim, fuel injector circuit, EVAP solenoid 0DM, ECT sensor, or MAF sensor DTC(s) present.

Engine run time longer than 4 minutes.

Bank 2 HO2S 1 signal voltage remains between 400 mV and 500 mV for longer than 10 seconds.

ACTION TAKEN WHEN THE DTC SETS

The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.

The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC

The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.

The history DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.

The DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

DIAGNOSTIC AIDS

Check for the following conditions:

Poor connection or damaged harness - Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.

Faulty HO2S heater or heater circuit - With the ignition ON the HO2S voltage displayed on a scan tool should gradually drop to below 300mV or rise to above 600mV. If not, disconnect the HO2S and connect a test light between the HO2S ignition feed and heater ground circuits. If the test light does not light, repair the open ignition feed or sensor ground circuit as necessary. If the test light lights and the HO2S signal and low circuits are OK, replace the HO2S.

Intermittent test - With the ignition ON, monitor the HO2S signal voltage while moving the wiring harness and related connectors. If the fault is induced, the HO2S signal voltage will change. This may help isolate the location of the malfunction.

TEST DESCRIPTION

Number(s) below refer to the step number(s) on the Diagnostic Table:

3. If the DTC P0154 test passes while the Fail Records conditions are being duplicated, an intermittent condition is indicated. Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

12. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.
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Thursday, September 3rd, 2020 AT 4:18 AM
Tiny
IGENIUS92
  • MEMBER
  • 1997 CHEVROLET CAMARO
  • 3.8L
  • V6
  • 2WD
  • MANUAL
  • 154,000 MILES
Hello, I have the car listed above with a manual 5 speed transmission. Today my check engine light came on with a code p0154. I looked it up and I want to find bank 1 sensor 2 o2 sensor to see if that would fix the issue. And maybe some more advice on how to fix this problem. It cut off on me twice at low idle, started right back up. But I want to fix this issue ASAP. Is there a map of where that sensor is for this code and or maybe some advice?
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Friday, September 4th, 2020 AT 11:11 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Good morning,

I attached the flow chart, wiring diagram for you for determining the failure for the code.

It seems I have posted an answer to this before but I never heard back on your results. Can you update on your results of testing?

https://www.2carpros.com/articles/how-to-check-wiring

This will not cause the car to cut off at all.

Roy

CIRCUIT DESCRIPTION

The PCM supplies a bias voltage of about 450mV between the HO2S signal and low circuits. When measured with a 10 megohm digital voltmeter, this may display as low as 320mV. The oxygen sensor varies the voltage within a range of about 1000mV when the exhaust is rich, down through about 10mV when exhaust is lean. The PCM constantly monitors the HO2S signal during closed loop operation and compensates for a rich or lean condition by decreasing or increasing injector pulse width as necessary. If the Bank 2 HO2S 1 voltage remains at or near the 450mV bias for an extended period of time, DTC P0154 will be set, indicating an open sensor signal or sensor low circuit.

CONDITIONS FOR SETTING THE DTC

No active transmission, Throttle Position (TP) sensor, EVAP system, EGR, misfire, IAT sensor, MAP sensor, fuel trim, fuel injector circuit, EVAP solenoid 0DM, ECT sensor, or MAF sensor DTC(s) present.

Engine run time longer than 4 minutes.

Bank 2 HO2S 1 signal voltage remains between 400 mV and 500 mV for longer than 10 seconds.

ACTION TAKEN WHEN THE DTC SETS

The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.

The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC

The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.

The history DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.

The DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

DIAGNOSTIC AIDS

Check for the following conditions:

Poor connection or damaged harness - Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.

Faulty HO2S heater or heater circuit - With the ignition ON the HO2S voltage displayed on a scan tool should gradually drop to below 300mV or rise to above 600mV. If not, disconnect the HO2S and connect a test light between the HO2S ignition feed and heater ground circuits. If the test light does not light, repair the open ignition feed or sensor ground circuit as necessary. If the test light lights and the HO2S signal and low circuits are OK, replace the HO2S.

Intermittent test - With the ignition ON, monitor the HO2S signal voltage while moving the wiring harness and related connectors. If the fault is induced, the HO2S signal voltage will change. This may help isolate the location of the malfunction.

TEST DESCRIPTION

Number(s) below refer to the step number(s) on the Diagnostic Table:

3. If the DTC P0154 test passes while the Fail Records conditions are being duplicated, an intermittent condition is indicated. Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

12. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.
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Friday, September 4th, 2020 AT 11:11 AM (Merged)
Tiny
IGENIUS92
  • MEMBER
Cleaned the throttle body and o2 sensors, discounted the battery while doing so and same code popped back on after. Please help?
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Sunday, September 6th, 2020 AT 5:59 PM
Tiny
ASEMASTER6371
  • EXPERT
What were the results of the flow chart?

You cannot clean a O2 sensor at all.

Clearing the code without any repairs will cause the light to come back on.

Roy
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Monday, September 7th, 2020 AT 4:28 AM
Tiny
IGENIUS92
  • MEMBER
Well, I haven't tested the sensor just cleaned the throttle body and tried to clean the o2 sensor.
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Monday, September 7th, 2020 AT 4:30 AM
Tiny
IGENIUS92
  • MEMBER
Bank 2 sensor 1 is the passenger side before the catalytic converter right? How many 02 sensors are on my vehicle? I see in two I think the ls1 has 4? But my car is a 1997 3.8L v6.
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Monday, September 7th, 2020 AT 4:37 AM
Tiny
ASEMASTER6371
  • EXPERT
I attached a picture of the location and circled it for you. It is before the catalytic converter.

You have 2.

Roy.
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Monday, September 7th, 2020 AT 4:43 AM
Tiny
IGENIUS92
  • MEMBER
I don't see a picture.
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Monday, September 7th, 2020 AT 4:45 AM
Tiny
ASEMASTER6371
  • EXPERT
I posted it 2 times. Once on the 3rd and once on the 4th. It is along with other pictures.

You need to open the pictures and look at them.

Roy
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Monday, September 7th, 2020 AT 4:48 AM
Tiny
IGENIUS92
  • MEMBER
Okay, thank you! My car only has two 02 sensors right?
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Monday, September 7th, 2020 AT 5:04 AM
Tiny
ASEMASTER6371
  • EXPERT
As I stated, yes, you only have 2 sensors.

Roy
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Monday, September 7th, 2020 AT 5:08 AM
Tiny
IGENIUS92
  • MEMBER
So unmeasured the o2 sensor using the 200. Ohms and 0.42 ohms I think it's a bad 02 sensor.
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Monday, September 7th, 2020 AT 2:25 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay. Try it and see.
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Monday, September 7th, 2020 AT 2:27 PM
Tiny
IGENIUS92
  • MEMBER
Yea, because I measured another 92 sensor off another vehicle and it read 14.5 ohms so for to replace this one.
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Monday, September 7th, 2020 AT 2:33 PM
Tiny
ASEMASTER6371
  • EXPERT
Do not go by that. What was the spec that was on the flow chart?

Roy
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Monday, September 7th, 2020 AT 2:54 PM
Tiny
IGENIUS92
  • MEMBER
Can't really understand the flow chart. I know a lot about cars but stuff like that I'm still learning. I'm sorry I just need all the help I can get.
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Monday, September 7th, 2020 AT 3:06 PM
Tiny
ASEMASTER6371
  • EXPERT
Do 1 step at a time and if you have an issue, post back to me and I will help guide you.

Roy
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Monday, September 7th, 2020 AT 3:13 PM
Tiny
IGENIUS92
  • MEMBER
Okay, thank you.
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Monday, September 7th, 2020 AT 3:43 PM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome.

Roy
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Monday, September 7th, 2020 AT 4:12 PM

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