P0174 on Dodge: How to Diagnose & Fix
System Too Lean (Bank 2)
2 Dodge models · 2 documented issues · 2 critical · $150-$800 repair
P0174 on Dodge by model: symptoms, diagnosis and fix
The 5.9L Magnum V8 intake manifold plenum gasket is a well-known failure point. The factory gasket degrades and allows engine oil to be drawn into the intake, causing oil consumption, misfires, and loss of power. The plenum pan sits atop the intake manifold and the gasket between them deteriorates over time. This is considered an inherent design flaw in all Magnum V8 engines (5.2L and 5.9L). Hughes Engines offers a permanent fix with a 1/4-inch aluminum plenum plate that replaces the thin factory plenum pan; it still installs with a new gasket set.
Common Symptoms
- Excessive oil consumption
- Engine misfires and rough idle
- Oily residue visible through throttle body
- Loss of power under load
- Engine pinging or knocking
How to Fix
Confirm plenum gasket failure by removing the air hat and throttle body and checking for pooled oil or heavy oily residue in the intake, then verify with a vacuum test if needed. Repair requires removing the intake manifold, replacing the failed plenum pan gasket with an upgraded kit or, preferably, installing a Hughes Engines billet aluminum plenum plate and revised gasket set, along with new intake manifold belly pan bolts and threadlocker. While apart, inspect the manifold for warping and replace related intake gaskets, coolant, and vacuum lines as needed before torquing everything to spec in sequence. Typical repair cost is about $400-$900 in parts and labor at an independent shop, or roughly $150-$350 in parts for a DIY repair depending on whether the billet upgrade is used.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Billet plenum plate, Fel-Pro intake/plenum gaskets, bolts and bypass hose
Repair a confirmed Magnum V8 belly-pan/plenum leak Fitment: Hughes states all 1992-2003 Dodge/Jeep 5.2L and 5.9L Magnum V8 engines Live direct manufacturer product page when checked
Sources for this issue (1)
The plenum pan gasket on the underside of the intake manifold fails, allowing engine oil to be sucked into combustion chambers. Causes excessive oil consumption, pinging, and visible oily sheen inside intake manifold through throttle body. Common on all 5.2L and 5.9L Magnum V8 engines.
Common Symptoms
- Engine pinging
- Excessive oil consumption
- Oily sheen visible inside intake through throttle body
- Rough idle
- Loss of power
How to Fix
Replace the plenum pan gasket using a plenum gasket set listed for your engine (Fel-Pro MS95462 lists the 1998-2000 Durango 5.2L). Hughes Engines plenum plate fix eliminates the design flaw entirely. Some owners install aftermarket M1 intake manifold which eliminates the plenum gasket.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Hughes HUG 7720FEL Magnum V8 plenum repair kit
Replace the failed stamped plate/gasket with the complete aluminum plate, Fel-Pro gaskets, bolts and bypass hose Fitment: 1992-2003 5.2L/5.9L Magnum V8 applications, covering this 1998-2003 Durango issue $195.48 on the live manufacturer …
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Sources for this issue (1)
P0174 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0174 mean on a Dodge?
P0174 stands for "System Too Lean (Bank 2)." P0174 means the engine computer detected that the air-fuel mixture on Bank 2 (the side of the engine that does not contain cylinder 1) is running too lean — too much air relative to fuel. The computer monitors this through the oxygen/air-fuel sensors and fuel trims; when it has to add a large amount of extra fuel to compensate and still can't reach the target, it flags the mixture as too lean. A lean condition can cause rough idle, hesitation, or misfires, and over time can raise combustion temperatures. Because it's Bank 2 specific, an unmetered air leak on that bank or a fuel delivery shortfall is typical. On Dodge it is documented across 2 models: Ram 1500, Durango.
What are the most common causes of P0174?
The most common causes of P0174 are: Vacuum or intake air leak (hoses, gaskets, PCV), Dirty or failing mass airflow (MAF) sensor, Weak fuel pump or restricted fuel filter (low fuel pressure), Clogged or underperforming fuel injectors, Leaking intake manifold or throttle body gasket, Faulty or contaminated oxygen / air-fuel sensor, Exhaust leak upstream of the oxygen sensor, Stuck-open EGR valve. The specific cause varies by vehicle.
How much does it cost to fix P0174 on a Dodge?
Published repair estimates on Dodge range from $150 to $800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.