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Old 06-19-2021, 08:31 PM   #1
swampyankee
 
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Default Code 33 P0402

Looking for info on code 33 (P0402) comes up as bad O2 sensor and/or bad BPT Valve.
Getting detonation (pinging) on acceleration. Egr was replaced about a year ago. No Vacuum leaks. Pair pipe does need to be welded to the y pipe on the exhaust. Have it capped right now.
Only code that comes up is 33.
94 KA, AT, RWD 116,000 miles. Other than this truck runs fine.

any suggestions.
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Old 06-19-2021, 08:49 PM   #2
LugNut1990
 
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Default

Smoke test in order. And then an EGR system diagnosis. What's your timing set to?
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Old 06-20-2021, 02:04 AM   #3
jp2code
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Long ago, it seems like another post was about a mysterious issue that went away after the pair pipe was replaced. He was trying to remove emissions stuff, it seems.
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