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What is trouble code PO154?

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Old Jan 12, 2004 | 09:35 AM
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Default What is trouble code PO154?

Installed Pace Headers and got a PO154 trouble code. Can't seem to find a trouble code chart.
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Old Jan 12, 2004 | 09:53 AM
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P0154 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1-A
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Old Jan 12, 2004 | 09:54 AM
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HO2S Circuit Insufficient Activity B2S1
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Old Jan 12, 2004 | 09:59 AM
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Thanks! What do I do to fix it?
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Old Jan 12, 2004 | 10:03 AM
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Did you use O2 extensions or splice into the harness and extend it? Check the wiring on the pass side front O2 sensor.
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Old Jan 12, 2004 | 10:09 AM
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Pace Setter supplied wire to extend the sensor wires. I spliced in these wires and soldered them together.

I'll take a look at the wires but don't see that I have done anything wrong as far as my splicing and soldering.
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Old Jan 12, 2004 | 10:12 AM
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Insufficient activity could be a problem with the heater circuit. If you have a scanner you need to monitor the sensor voltage while in closed loop.

The EFILive charts would be nice so you could compare the sweeping of B1S1 and B2S1..

Since you did headers check and double check the wiring harness and connectors to the sensor. Look at the pins and make sure they're not pushed in.

If everything looks good you may need a new sensor.. You could always swap B1 with B2 and see if the code move to the other bank just be be sure before you spend $80 on a new sensor.
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Old Jan 12, 2004 | 10:22 AM
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Originally Posted by 2002WS6_MN6
Insufficient activity could be a problem with the heater circuit. If you have a scanner you need to monitor the sensor voltage while in closed loop.

The EFILive charts would be nice so you could compare the sweeping of B1S1 and B2S1..

Since you did headers check and double check the wiring harness and connectors to the sensor. Look at the pins and make sure they're not pushed in.

If everything looks good you may need a new sensor.. You could always swap B1 with B2 and see if the code move to the other bank just be be sure before you spend $80 on a new sensor.
I cleared the code out and no SES light at idle now. I'll take it for a drive and see if it comes back on. If it does then I'll swap out the sensors like you recommended and see what happens.
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Old Jan 12, 2004 | 10:32 AM
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Splicing into the sensor leads is not a good thing to do. It is better to extend the wiring harness on the car if you are not going to buy extensions.
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Old Jan 12, 2004 | 11:44 AM
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Originally Posted by 2xLS1
Splicing into the sensor leads is not a good thing to do. It is better to extend the wiring harness on the car if you are not going to buy extensions.
Looks like I need to buy the extensions if splicing is not going to work. Why did Pace Setter supply wires to splice if this doesn't work?

The SES light came back on after I cleared it. Engine runs terrible. Misses bad.

Last edited by Larry; Jan 12, 2004 at 11:55 AM.
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Old Jan 12, 2004 | 12:03 PM
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Splicing will work.. A quality soldered spliced connection will work fine..
Notice the word quality.

Make sure you use some shrink wrap to protect the connection.
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Old Jan 12, 2004 | 12:04 PM
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Remember this is a milivolt sensor.. the slightest resistance in your connection will cause problems..
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Old Jan 12, 2004 | 01:10 PM
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Originally Posted by 2002WS6_MN6
Splicing will work.. A quality soldered spliced connection will work fine..
Notice the word quality.

Make sure you use some shrink wrap to protect the connection.
That just may be the problem. My solder joints are kinda puny.
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Old Jan 12, 2004 | 02:26 PM
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Purple wire, passenger side pulled apart. Bad solder!

Can always rely on the guys from LS1 Tech to help. Thanks guys!
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Old Jan 12, 2004 | 03:31 PM
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O2s need outside air to reference to.
The O2 wires are special so they have a airchannel inside them to get that outside air at the O2 connector where temps are cooler.
Without that the O2 cannot function correctly.
Splicing will cause O2s to act weird and false readings to PCM so I would not spice at all.
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Old Jan 12, 2004 | 04:33 PM
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Originally Posted by Team ZR-1
O2s need outside air to reference to.
The O2 wires are special so they have a airchannel inside them to get that outside air at the O2 connector where temps are cooler.
Without that the O2 cannot function correctly.
Splicing will cause O2s to act weird and false readings to PCM so I would not spice at all.
Like I said above, you do not extend the O2 sensor, you extend the harness on the car. Thank you TeamZR-1 for backing me up on this.
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Old Jan 12, 2004 | 04:45 PM
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Originally Posted by Team ZR-1
O2s need outside air to reference to.
The O2 wires are special so they have a airchannel inside them to get that outside air at the O2 connector where temps are cooler.
Without that the O2 cannot function correctly.
Splicing will cause O2s to act weird and false readings to PCM so I would not spice at all.
Thanks! Looks like I may still have a problem. Better go get me an extender.

I'll give it a test drive next and see what Auto Tap says.
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