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1998 Ford Econoline 250 Check Engine Light: Codes P0156, P1131, P1151, P0301-P0306 with Rough Idle and Lean Conditions

Model: 1998 Ford Econoline 250 Fault Code: P0156 Posted: 2008-12-14 19:51

My 1998 Ford Econoline 250 Cargo Van has a check engine light illuminated. The vehicle exhibits rough idle and hesitation at idle. Diagnostic trouble codes detected include P0156, P1131, P1151, P0301, P0302, P0303, P0304, P-0305, P0306, and P0171/P0174. These codes suggest multiple issues: lean air-fuel mixture in the intake system, potential misfires across all cylinders, and possible fuel delivery problems. I'm seeking advice on how to diagnose and resolve these issues effectively.

Related fault codes

P0156P0301P0302P1131P1151

Comments (2)

Anonymous 2008-12-14 20:14

The presence of multiple lean codes (P0171, P0174) and misfire codes (P0301-P0306) indicates a system-wide lean condition. Start by inspecting the fuel filter and fuel pressure—low fuel pressure or a clogged filter can cause lean mixtures and misfires in a 1998 Ford Econoline 250.

Anonymous 2008-12-16 19:58

Vacuum leaks are a common cause of lean conditions and misfires, especially in older vehicles. Check the PCV (Positive Crankcase Ventilation) hoses for cracks or disconnections, as these can introduce unmetered air into the intake system and affect engine performance in a 1998 Ford Econoline 250.