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Oxygen sensor, codes P0154 and P2254

Tiny
DAKETANI
  • MEMBER
  • 2005 HONDA PILOT
  • 6 CYL
  • AUTOMATIC
  • 197,000 MILES
I replaced the upstream oxygen sensor. I drove it for a hour then the engine light came back on with the VTM coming on periodically. I also have a P0128 that AutoZone machine detected.
Monday, October 29th, 2018 AT 9:58 AM

17 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

Why did you replace the O2 sensor?

Code 128 is for the thermostat in the cooling system. The engine is running too cold.

Roy

P0128
Descriptor
Probable Causes
Poor Connections or Loose Terminals At Engine Coolant Temperature (ECT) Sensor 1, ECT Sensor 2 and Powertrain Control Module (PCM)
Powertrain Control Module (PCM)
Powertrain Control Module (PCM) Update Needed
Radiator Fan
Thermostat
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Monday, October 29th, 2018 AT 12:01 PM
Tiny
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I took it to AutoZone and it came back with P0154 and P2254 along with P0128.
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Monday, October 29th, 2018 AT 1:31 PM
Tiny
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My uncle replaced the Oxygen Sensor with one he found at the Pick a Part store.
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Monday, October 29th, 2018 AT 1:33 PM
Tiny
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Okay, sorry to hear that. Used parts are never recommended especially electrical parts.

The 128 could be the whole issue if the sensor was reading rich from the cold engine.

I would replace the thermostat with a new one only and see if the code returns.

Roy

Thermostat Replacement
1. Make sure you have the anti-theft codes for the radio and navigation system, then write down the customer's radio station presets.
2. Disconnect the negative cable from the battery.
3. Drain the engine coolant.

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4. Disconnect the breather pipe (A), then remove the intake air duct (B).

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5. Remove the bolt (A) securing the harness cover, then remove harness cover.

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6. Remove the thermostat cover (A), then remove the thermostat (B).
7. Face the pin (C) toward the upside, install the thermostat with new rubber seal (D).
8. Install the harness cover.
9. Install the intake air duct, then connect the breather pipe.
10. Connect the negative cable to the battery.
11. Refill the radiator with engine coolant, then bleed air from the cooling system.
12. Clean up any spilled engine coolant.
13. Do the power window reset procedure.
14. Enter the anti-theft codes for the radio and the navigation system, then enter the customer's radio station presets.
15. Set the clock.
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Monday, October 29th, 2018 AT 1:40 PM
Tiny
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I had already replaced the thermostat before the oxygen sensor. He got the oxygen sensor from Pick a Part.
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Monday, October 29th, 2018 AT 1:44 PM
Tiny
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What temperature thermostat did you use?
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Monday, October 29th, 2018 AT 1:52 PM
Tiny
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I am not sure what he put in!
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Monday, October 29th, 2018 AT 2:02 PM
Tiny
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It has to be at least 195.
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Monday, October 29th, 2018 AT 2:06 PM
Tiny
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What is 195?
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Monday, October 29th, 2018 AT 2:07 PM
Tiny
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Could that cause the oxygen sensor codes pop up?
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Monday, October 29th, 2018 AT 2:08 PM
Tiny
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195 is the temperature of the thermostat.

Yes, as I stated before, it could have been the root cause of the other two codes.

Roy
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Monday, October 29th, 2018 AT 2:27 PM
Tiny
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We used the Failsafe Thermostat from Autozone. Would that matter?
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Monday, October 29th, 2018 AT 5:32 PM
Tiny
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The temperature is what matters. Need to know the temperature rating.

Roy
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Tuesday, October 30th, 2018 AT 1:18 AM
Tiny
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Thanks so much for your help Roy! The thermostat is 170. I have been looking online for one that is 195 but cannot seem to find anything.
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Tuesday, October 30th, 2018 AT 2:19 AM
Tiny
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You need to replace with a 195. Any parts store has these in stock.

You are welcome.

Always glad to help.

Roy
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Tuesday, October 30th, 2018 AT 2:28 AM
Tiny
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Hello Roy, I changed the Thermostat to the Honda Thermostat which now the code P0128 is now cleared. The code P0154 is still coming up.
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Tuesday, October 30th, 2018 AT 2:05 PM
Tiny
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OK, time to go back to honda parts and get the upstream O2 sensor. Take out that used one and throw it away.

Roy

P0154
Descriptor
Probable Causes
Air Fuel (A/F) Ratio Sensor 1
Poor Connections or Loose Terminals At Air Fuel (A/F) Sensor 1, Air Fuel (A/F) Sensor Relay and Powertrain Control Module (PCM)
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Tuesday, October 30th, 2018 AT 2:15 PM

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