Help with Service Code
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Senior User
Joined: Jul 2004
Posts: 195
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Help with Service Code
01 XLT 4.6 - service code PO174 - System too lean. Anyone know what would be causing this code. Check engine light has been on for 3 or 4 days. Had the truck scanned at Advance Auto Parts. Could it be bad gas??
Elder User
Joined: Nov 2001
Posts: 892
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From: Duluth, MN
Check for an exhaust leak along the bank 2 as well... Try spraying carb/brake cleaner around the intake manifold and watching for an idle change. If you have the ability to watch the O2 PIDs, do so. Try getting the sensor to go rich with propane into the intake to ensure it isn't a faulty O2 sensor that is just reading LEAN...
