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31/03/2021 9:59 am
Topic starter
I got myself an 08 sierra denali and it has had a check engine light on since the day i got it. I scanned it with my cheap amazon scanner and got codes {P0174, P0191, P069E, P0171} I have already checked for any major leaks and replaced the pcv valve because that was throwing a code too. It measured around 48 psi of fuel pressure though im not sure how accurate that is because its just from my cheap scanner.
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31/03/2021 12:02 pm
For P0171 and P0174 start here:
https://www.obd-codes.com/p0174
https://repairpal.com/obd-ii-code-p0174
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31/03/2021 12:08 pm
For P0191 see below: this could also be triggering P0171 and P0174 codes so start here first
https://repairpal.com/obd-ii-code-p0191
https://www.obd-codes.com/p0191