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1996 Buick Regal PO300 & PO135 Codes

Tiny
HJT1957
  • MEMBER
  • 1996 BUICK REGAL
  • V12
  • FWD
  • AUTOMATIC
  • 77,000 MILES
Looking to get clarity on the two codes.
I have replaced the wires and plugs. The service engine light is now out. Is there anything else I should do or be on the lookout for (troublewise). The car runs smooth now, but, I still have a feeling of uncertainty for something "major" that might happen. Your help would be appreciated.
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Thursday, January 22nd, 2009 AT 6:34 AM

1 Reply

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
The P0300 is random cylinder miss which you fixed with plugs and wires. The P0135 is problem in heated O2 sensor Bank1 sensor 1. If running good the O2 should pose no problem it will still function just take longer to get to operating temp.
Hope this helps
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Friday, January 23rd, 2009 AT 11:35 AM

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