What is the 1997-2004 Ford F-150 4.6L / 5.4L 2-Valve Triton Timing Chain Tensioner and Plastic Guide Rattle?

The 2-valve 4.6L and 5.4L Triton V8s (distinct from the later 3-valve cam-phaser motors) use hydraulic timing-chain tensioners and plastic chain guides that wear and fail with age. The tensioners bleed down oil pressure overnight, so the chains slap on cold start; over time the b… Repairs typically run $800-$2,500. Severity: high.

What is the 1997-2008 Ford F-150 Coil-On-Plug (COP) Ignition Coil Failure — Misfire and Rough Idle (Triton V8)?

The 4.6L and 5.4L Triton V8s use one coil-on-plug per cylinder, and these coils are a very common failure item — subjected to heat, vibration, and moisture from cowl leaks — typically starting after 80k miles. A failed coil sets a cylinder-specific misfire (P0301-P0308) and often… Repairs typically run $200-$800. Severity: medium.

What is the 1997-2010 Ford F-150 Transfer Case Shift Motor / Encoder Failure — 'Check 4x4', 4WD Won't Engage?

On electronic shift-on-the-fly 4WD F-150s, the transfer-case shift motor (and its internal encoder that reports gear position back to the control module) is a common failure. Owners see a flashing 4WD indicator or 'Check 4x4' message, the system fails to engage or disengage 4HI/4… Repairs typically run $250-$650. Severity: medium.

What is the 1997-2004 Ford F-150 PATS Anti-Theft No-Start — Cranks but Won't Start with Theft Light Flashing?

The Passive Anti-Theft System (PATS) on these trucks disables fuel/injection when the PCM cannot verify the key transponder, leaving the truck cranking but not starting with the dash theft/security light flashing rapidly. Common triggers are a worn or dead key transponder, a loos… Repairs typically run $100-$500. Severity: medium.

What is the 1997-2004 Ford F-150 DPFE / EGR Pressure Sensor Failure — Rough Idle, Stalling, and P0401 (2-Valve Triton)?

The Delta Pressure Feedback EGR (DPFE) sensor and the EGR throttle-body spacer passages are a chronic Check-Engine source on 1997-2004 4.2L/4.6L/5.4L trucks. The ceramic DPFE sensor drifts or cracks, and the narrow 90-degree EGR elbow passages carbon up until flow is blocked, set… Repairs typically run $50-$250. Severity: medium.

What is the 1997-2004 Ford F-150 One-Piece Driveshaft Slip-Yoke Clunk (TSB) — Clunk/Grunt on Light Acceleration or Braking (4x4)?

Many 1998-2004 F-150 4x4s with a one-piece driveshaft develop a clunk or grunt during light-to-moderate acceleration or braking and when moving off from a stop. Ford issued a TSB attributing it to the slip-yoke splines: the factory grease dries and gets tacky, so the shaft won't… Repairs typically run $60-$300. Severity: low.

What is the 1997-2014 Ford F-150 Door Ajar Switch Sticks — Dome Lights Stay On and Battery Drain?

The door-ajar switch built into the door latch sticks or corrodes so the truck thinks a door is open. The result is a 'door ajar' warning that stays on, interior/dome lights that won't shut off, chimes, and a parasitic battery drain that can leave the truck dead overnight. It is… Repairs typically run $40-$200. Severity: low.

Ford · Known Issues

2001 Ford F-150 Problems: 13 Issues Every Owner Should Know

2001 model year · 1,523+ owner reports · Updated July 2026

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According to Au7o's analysis of 1,523+ owner reports, the 2001 Ford F-150 has 13 documented known issues, with 7 rated critical. The most serious are Spark Plug Thread Blowout ($150-$500 repair), Speed Control Deactivation Switch Underhood Fire (Recall 05V388) ($0-$0 repair), In-Tank Fuel Pump Failure — Whining, Hard Starting, Stalling Under Load, and No-Start ($250-$700 repair), 4.6L / 5.4L 2-Valve Triton Timing Chain Tensioner and Plastic Guide Rattle ($800-$2,500 repair), Fuel Tank Strap Corrosion — Straps Rust and Break, Tank Can Drop (Recall 11S21 / NHTSA 11V385) ($0-$600 repair), Internal Radiator Transmission Cooler Fails — Coolant/ATF Cross-Contamination ('Strawberry Milkshake') ($400-$1,500 repair) and 4R70W / 4R75W Automatic Transmission Failure — No Reverse, Loss of Forward Gears, and Slipping ($1,800-$3,500 repair). The most commonly reported issue is Spark Plug Thread Blowout with 1,523 owner reports. at .

Frequently Asked Questions

What are the most common Ford F-150 problems?

According to Au7o's analysis of 1,523+ owner reports, the 2001 Ford F-150 has 13 documented issues. The most frequently reported are: Spark Plug Thread Blowout, Speed Control Deactivation Switch Underhood Fire (Recall 05V388), In-Tank Fuel Pump Failure — Whining, Hard Starting, Stalling Under Load, and No-Start. Of these, 7 are rated critical and should be addressed promptly.

Is the Ford F-150 reliable?

The 2001 Ford F-150 has 13 known issues documented across 1,523+ owner reports. 7 issues are rated critical: Spark Plug Thread Blowout and Speed Control Deactivation Switch Underhood Fire (Recall 05V388) and In-Tank Fuel Pump Failure — Whining, Hard Starting, Stalling Under Load, and No-Start and 4.6L / 5.4L 2-Valve Triton Timing Chain Tensioner and Plastic Guide Rattle and Fuel Tank Strap Corrosion — Straps Rust and Break, Tank Can Drop (Recall 11S21 / NHTSA 11V385) and Internal Radiator Transmission Cooler Fails — Coolant/ATF Cross-Contamination ('Strawberry Milkshake') and 4R70W / 4R75W Automatic Transmission Failure — No Reverse, Loss of Forward Gears, and Slipping. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Ford F-150 problems?

Repair costs for known Ford F-150 issues range from $0 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Spark Plug Thread Blowout, typically costs $150-$500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 1997-2003 Ford F-150 Spark Plug Thread Blowout?

The aluminum cylinder heads on Triton V8 engines have only 4 threads for spark plugs instead of the standard 8-10. This can cause spark plugs to blow out of the head, damaging threads. Helicoil repair kits are available. Repairs typically run $150-$500. Severity: high.

All 13 Known Issues

Other Ford Models

Frequently Asked Questions

What are the most common Ford F-150 problems?

Is the Ford F-150 reliable?

How much does it cost to fix common Ford F-150 problems?

What is the 1997-2003 Ford F-150 Spark Plug Thread Blowout?

What is the 1997-2002 Ford F-150 Speed Control Deactivation Switch Underhood Fire (Recall 05V388)?

1997-2003 Ford F-150: Spark Plug Thread Blowout#

1997-2004 Ford F-150: 4.6L / 5.4L 2-Valve Triton Timing Chain Tensioner and Plastic Guide Rattle#

1997-2004 Ford F-150: In-Tank Fuel Pump Failure — Whining, Hard Starting, Stalling Under Load, and No-Start#

1997-2004 Ford F-150: Fuel Tank Strap Corrosion — Straps Rust and Break, Tank Can Drop (Recall 11S21 / NHTSA 11V385)#

1997-2002 Ford F-150: Speed Control Deactivation Switch Underhood Fire (Recall 05V388)#

1997-2008 Ford F-150: Coil-On-Plug (COP) Ignition Coil Failure — Misfire and Rough Idle (Triton V8)#

1997-2004 Ford F-150: PATS Anti-Theft No-Start — Cranks but Won't Start with Theft Light Flashing#

1997-2014 Ford F-150: Door Ajar Switch Sticks — Dome Lights Stay On and Battery Drain#

1997-2010 Ford F-150: Internal Radiator Transmission Cooler Fails — Coolant/ATF Cross-Contamination ('Strawberry Milkshake')#

1997-2008 Ford F-150: 4R70W / 4R75W Automatic Transmission Failure — No Reverse, Loss of Forward Gears, and Slipping#

1997-2010 Ford F-150: Transfer Case Shift Motor / Encoder Failure — 'Check 4x4', 4WD Won't Engage#

1997-2004 Ford F-150: One-Piece Driveshaft Slip-Yoke Clunk (TSB) — Clunk/Grunt on Light Acceleration or Braking (4x4)#

1997-2004 Ford F-150: DPFE / EGR Pressure Sensor Failure — Rough Idle, Stalling, and P0401 (2-Valve Triton)#

What is the 1997-2004 Ford F-150 In-Tank Fuel Pump Failure — Whining, Hard Starting, Stalling Under Load, and No-Start?