Check engine code P0054

2005 FORD FOCUS
176,000 MILES
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LGLREAVES
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I recently had a P0420 code come up on my car. So I changed out the o2 sensor. After changing that I got a P0054 code so I changed out the other o2 sensor. I can clear out the code and as long as the engine is warm when I clear out the code the code will not come back on. However, When I allow the engine to be shut off for more than 2-3 hours as soon as I get back in and start the car and start to drive the car the check engine light come right back on. The code is always a P0054 HO2S Hearter Resistance Bank 1 Sensor 2. What can I do to fix this?
Feb 22, 2012 at 5:42 PM
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ASEMASTER6371
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the 420 code is a cat code. the cat has failed and will need to be replaced.
with that said, i wonder if you replaced the o2 sensor with a wrong sensor to trigger a heater code. re check and make sure you have the correct sensor. did you use an exact replacement or universal??

Roy
Feb 22, 2012 at 5:51 PM
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LGLREAVES
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It was an exact replacement. So if I change the cat will it solve the code?
Feb 22, 2012 at 5:57 PM
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ASEMASTER6371
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the 420 code yes. not the 54, that was created from you replacing the o2. thats why i said to verify the correct sensor. check the fuses too as there is one for the o2 heaters.

Roy
Feb 22, 2012 at 6:01 PM