Same codes over and over no matter what I do

C

CatDad

Test Drive
Location
California

Repair Questions​

I have been getting the same four codes over and over (P0171, P0153, P2a03, P430)... Coils and plugs have been changed, Cadillac converters have been changed, O2 sensor sensor 1 bank 2 has been changed. Both cam sensors have been changed. This is getting very frustrating. I do smell some exhaust...
 
TerryD

TerryD

Total Tease
Supporting Member
Location
Covington, Va
Some things to check per the service manual:

PCV hoses
MAF sensor clean
Fuel pressure (with a gauge to verify proper levels)
Intake tract boots at air box and throttle body

Do you have a scan tool to run live diagnostic scans on sensors? A Bluetooth ELM327 from Amazon for like $20 and the Torque app for android is what I use.

I would look at your long term fuel trends to see where they stand. A few % is normal but 8-10%+ is a big issue.

My 2007 had a cracked boot at the throttle body that caused some issues. I would start there.
 
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