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2007 DTS
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15 Posts
Discussion Starter #1
My service engine soon light appeared briefly this morning on my 1994 devile. I ran the diagnostic mode on the panel, it it showed a code "PO44". It also showed a PCM? which I don't understand. What can I do to correct this problem with the O2 sensor? Replace the right O2 sensor.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,990 Posts
"PCM?" is asking if you want to enter the PCM mode.

Before replacing the O2 sensor, look for a vacuum leak that would affect the right bank.
 
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