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1998 Dodge Dakota R/T P0171 and P0174 Fault Codes: MAF Sensor, Vacuum Leaks, and Engine Diagnostics

Model: 98 dodge dakota R/T Fault Code: P0171 Posted: 2007-03-30 05:40

I own a 1998 Dodge Dakota R/T with 114,000 miles. The vehicle is showing fault codes P0171 (System Too Lean Bank 1) and P0174 (System Too Lean Bank 2). I want to know if this truck is equipped with a Mass Air Flow (MAF) sensor, and whether it could be the root cause of these lean conditions. I've already replaced the PCV valve and inspected all vacuum lines, but I'm looking for a reliable vacuum lines diagram — does anyone know where I can find one? This vehicle is powered by a 5.9L V8 engine.

Related fault codes
P0171P0174
Comments (3)
Anonymous 2007-03-30 06:51

The 1998 Dodge Dakota R/T does not have a MAF sensor; it uses only a Manifold Absolute Pressure (MAP) sensor. Please check your fuel pressure and inspect both the upstream and downstream oxygen sensors for proper function.

Anonymous 2007-03-30 15:25

To complement Jeff's advice, since both engine banks are reporting 'running lean' conditions, you must thoroughly check for vacuum leaks — these can often be subtle and not immediately visible during a visual inspection.

Anonymous 2007-03-30 16:01

A common issue on this model is a blown intake plenum gasket. This problem may not always show obvious external leaks, so it's important to inspect the entire intake system carefully for signs of leakage or performance drops.