Buyer's guide

Buying a Used 7.3 Powerstroke: What to Look For, Best Years and Costs

Published September 25, 2026 · Updated October 10, 2026 · 15 min read

The youngest 7.3 Power Stroke is now more than 20 years old, so the truck in front of you has had two decades to collect problems, and repairs, from its owners. The engine's reputation is deserved, but the most-reported failure on it is a sensor that can shut the engine off at highway speed. One 1999 owner told NHTSA the truck died while towing a stock trailer: "No power brakes or steering."

This guide takes you through a used 7.3 in the order you will inspect it. It is built from 607 NHTSA owner complaints on 1994-2003 Ford diesels, Ford's recalls and service bulletins, and current part prices, and it says where that evidence is thin.

The one idea: the build era decides the hardware

The 7.3 spent nine model years in two very different trucks. The old-body F-250 and F-350 (1994.5-1997, often called OBS) use single-shot injectors, a 15-degree high-pressure oil pump and a turbo without a wastegate. The Super Duty (1999-2003, plus the 2000-2003 Excursion) uses split-shot injectors, a 17-degree pump, an electric frame-rail fuel pump and, from partway through 1999, a wastegated turbo. There is no 1998 Super Duty. verified

That matters when you buy, because injectors, the oil pump and the turbo are not interchangeable between eras. A seller's "new injectors" or "new pump" only means something if the parts match the truck. It also matters for 2003: the 6.0 replaced the 7.3 early in the 2003 model year, so a 2003 Super Duty may have either engine. The eighth character of the VIN tells you: F for the 7.3, P for the 6.0. aggregated

What 7.3 Power Stroke owners report to NHTSA

One problem dominates: the camshaft position sensor, named in 130 complaints, more than all other engine problems together. 226 of the 607 complaints mention a stall or the engine shutting off, and 40 of the CPS complaints mention power steering or power brakes, usually lost when the engine died. That is why owners reported it to a safety regulator.

Most of the other well-known 7.3 problems barely register: high-pressure oil pump wear (3), injector o-rings (2), up-pipes (0). That does not mean they are rare. A truck that is hard to start when hot or leaks oil in the valley annoys its owner but rarely makes them file a federal safety complaint, so the count understates these.

7.3 Powerstroke best years: what the data says by year

Short answer: the data does not crown a best year. The CPS complaints cluster on 1999-2002 Super Duty trucks, but those are also the years with the most trucks on the road and the most complaints overall. OBS trucks (1994.5-1997) draw fewer complaints in every category. Buy the best-kept truck, not the best year.

Complaints: NHTSA owner complaints filed on 1994-2003 Ford F-250, F-350, Excursion and E-Series diesels, pulled 2026-09-12, extra NHTSA model names added 2026-10-10. Raw counts, not adjusted for how many trucks were sold: Ford sold far more Super Duty diesels than OBS diesels, and NHTSA has few complaints from before 2000 for any truck. There is no 1998 Super Duty; the few 1998 complaints are left out of this table.

How to read this table. Raw counts, and NHTSA has few complaints from before 2000 for any vehicle, so the OBS years look cleaner than they may be. Two more things to know:

• The CPS complaints are a 2006-2008 wave. 109 of the 130 were filed in those three years, around the time Ford announced its recall. The sensor did not start failing in 2006; that is when owners learned it had a name.
• 2003 needs care. The 2003 complaints include 6.0 trucks whose owners did not name the engine, so the 2003 row is not a 7.3 row. Check the VIN.

Buyer's guides argue about the best 7.3: the OBS trucks for their simpler mechanical fuel pump and older design, or the 1999.5-2003 trucks for the wastegated turbo and more power. Both camps have a point and neither has data to settle it. aggregated

Before you drive out to see it

• Run the VIN at NHTSA's recall lookup. Two recalls matter on the 7.3: Ford's CPS recall 07V-553 (Ford number 07S57) on 1997-2003 trucks, and the speed control deactivation switch recall 09V-399 (Ford 09S09), which can cause a fire with the engine off. verified
• Check the VIN's eighth character on a 2003: F is a 7.3, P is a 6.0.
• Ask the seller not to start it before you arrive. You need a cold start.
• Ask for records: CPS, glow plugs and relay, under-valve-cover harness, fuel filter housing, any injector, oil pump or turbo work, with dates and mileage.

Step 1: the cold start (glow plugs and harness)

What to do. With the engine cold, turn the key and wait for the wait-to-start light to go out before cranking. Listen for the glow plug relay to click. Count the cranking time and watch the exhaust.

What you will see. A healthy 7.3 starts within a few seconds of cranking, even on a cool morning, and any white smoke clears quickly. Long cranking below about 40 °F, a rough idle that smooths out as it warms, or white smoke that hangs on point to the cold-start system: glow plugs, the glow plug relay, or the harness that runs under the valve covers. aggregated Blue-gray smoke at startup that clears as the engine warms points to the injector o-rings. aggregated

Why. The 7.3 needs glow plugs to start in the cold, and its injector and glow plug wiring passes through the valve cover gaskets, where heat and vibration loosen connectors. A dropped connector kills an injector or a glow plug; the engine runs rough until it warms.

What it costs. Glow plugs list for about $18 each (eight per engine), the relay $52 to $83 and the Super Duty under-valve-cover harness $76 to $108. One 2000 owner told NHTSA in 2006 that a loose injector and glow plug harness connector took a dealer all day and cost $675, for a $17 retaining part.

Step 2: crank it and watch the tachometer (the CPS test)

What to do. Any time the truck stalls or will not start during your inspection, crank it and watch the tachometer.

What you will see. On a 7.3, the tachometer reads from the camshaft position sensor. If the needle does not move while the engine cranks, the CPS is the first suspect. aggregated A truck with a failing sensor runs normally most of the time, then dies without warning, often when hot, and may restart after it cools.

"Driving along towing a 21' goose neck stock trailer and the truck shut down. No power brakes or steering. Engine just died."

Owner of a 1999 F-250 Super Duty, 2007. NHTSA complaint 10188577

The recall. Ford recalled about 1.18 million 1997-2003 F-250 through F-550 Super Duty, Excursion and E-Series trucks with the 7.3 in December 2007 (NHTSA 07V-553, Ford 07S57): the sensor "may function intermittently, possibly resulting in an engine stall." Dealers inspect the sensor and replace it with an improved one free of charge. verified If the VIN lookup shows the recall open, have it done before you rely on the truck.

It can fail more than once. At least 10 CPS complaints describe a second, third or fourth sensor. Ford also issued an earlier bulletin on a false P0340 cam sensor code on some 2002 trucks with the 7.3 (032148). verified

"This is the 4th CPS I've had in this truck. The truck has 60K miles."

Owner of a 2000 F-250 Super Duty, 2007. NHTSA complaint 10205983

What it costs. The sensor lists for about $31 to $37 and changes in minutes on the front of the engine. In 2007 two owners paid $453 and $504 in total at a dealer. A 2000 owner's dealer told them to keep a spare in the glove box, which is still common advice for 7.3 owners. aggregated

Step 3: hood up: fuel filter housing, valley and turbo

What to do. With a flashlight, look into the engine valley between the cylinder heads, at the fuel filter housing on top of the engine, around the turbo base and at the back of the engine where the exhaust up-pipes meet the turbo.

What you will see.

• Fuel at the filter housing or in the valley. The aluminum filter housing cracks with age, its o-rings harden and the plastic drain valve leaks. Its heater element can also short, blow the fuel pump fuse and look like an electrical no-start. verified Nine complaints describe fuel leaks at the filter housing or on the engine, some severe: one 2000 owner was losing 4 to 6 gallons of fuel along the road from the drain valve.
• Oil around the turbo base. The turbo pedestal's o-rings harden and leak; Ford issued three bulletins on pedestal leaks for 2000-2003 trucks (031410, 03192, 032151). It looks bad but is a gasket-level repair. verified Check that the intake boots are not oil-soaked; they can blow off under boost.
• Soot at the back of the engine. Black streaks where the up-pipes join point to blown exhaust donut gaskets, which cost boost and raise exhaust temperatures. aggregated

What it costs. A filter housing seal kit lists for about $20 to $23, turbo pedestal o-rings about $10, a replacement pedestal about $125, up-pipe donut gaskets about $19 and a full up-pipe kit about $199. The parts are cheap; the labor is in getting to them.

Step 4: scan it, then do a hot restart (the oil system)

What to do. Read stored codes with a scan tool that shows engine data. With the engine fully warm after the test drive, shut it off for a few minutes and restart it.

What you will see. It should restart hot as easily as it did cold. A long crank or no-start when hot, with normal cranking speed, points to the high-pressure oil system that fires the injectors: the oil pump (HPOP), the injection pressure regulator (IPR) or leaking o-rings. aggregated On the scan tool, injection control pressure (ICP) that cannot keep up with what the engine asks for, while the IPR duty cycle runs high, tells the same story. aggregated

Why. The 7.3's injectors are fired by engine oil at high pressure, not by a fuel pump. Hot oil is thinner and leaks past worn seals more easily, so a tired system shows up hot first. Low or old oil makes it worse, which is why oil quality matters more on this engine than most.

What it costs. Check the cheap causes first: IPR and ICP o-rings, then the IPR valve ($215 to $292) and the ICP sensor ($61 to $87). The oil pump lists for about $585 (early) to $626 (late), and injectors run $131 to $376 each by type. One 2002 owner reported the oil pump o-ring failing three times, the last repair costing $561.82 in 2008.

Step 5: underneath: the fuel tank straps

What to do. Get under the truck with a flashlight and look at the fuel tank or tanks and the steel straps that hold them up.

What you will see. Straps rusted thin or broken, or rust and wet spots on the tank. On trucks this old in salt states, the straps can rust through and drop the tank. 22 complaints describe failed tank straps or a leaking or rusted tank.

"Diesel fuel tank fell down because of rusted tank straps and leaked 30 gallons of fuel onto roadside."

Owner of a 1999 F-250 Super Duty, 2014. NHTSA complaint 10631865

Look at the frame, brake lines and cab corners while you are there. On a 20-plus-year-old truck, rust often ends the deal before the engine does.

Step 6: the road test

What to do. Drive at least 20 minutes, including a highway stretch and a hill if you can, and tow if the seller allows it.

What you will see. Steady power without stumbling, no surging at a steady speed, and no stall when you come to a stop. A loud whooshing exhaust noise and weak power when cold that clear as it warms point to a sticking exhaust back-pressure valve (EBPV), which helps the engine warm up. aggregated A chirp or hiss under load points to up-pipe leaks. Shifting quality belongs to the transmission, which has its own complaint history that this engine guide does not cover.

What you found, and what to do about it

Part prices are OEM and aftermarket list prices at the time of publication. Owner-reported costs come from NHTSA complaints and show what those owners paid in those years, not a quote. We do not have reliable labor estimates for these jobs.

What we cannot tell you

• How often each problem happens. Complaints are not failure rates, and the CPS dominates partly because a stall at speed is exactly what people report to a safety agency. Hot-start and oil leak problems are undercounted.
• Which year is truly best. We have no sales figures by year, NHTSA has few complaints from the 1990s, and the 2003 complaints mix in the 6.0.
• What a 7.3 is worth. We do not track used truck prices, and the market for clean 7.3 trucks moves on condition, mileage and rust more than on the engine.
• The condition of this truck. After 20-plus years, maintenance and how it was used matter more than anything in these counts.
• Rebuild costs. A full engine rebuild depends on what is found inside; we do not have reliable labor figures.

FAQ

Go deeper

Each of these pages shows the sources behind every claim, the confidence tier and the part numbers:

• Ford 7.3 Power Stroke platform page
• Failure modes: Camshaft position sensor · Fuel filter housing · Glow plugs and relay · Under-valve-cover harness · High-pressure oil pump · IPR valve · Injector o-rings · Turbo pedestal · Up-pipes
• Repairs: CPS replacement · Cold-start service · Oil system diagnosis
• Parts: CPS 1997-2003 · CPS 1994-1996 · Glow plug relay · Under-valve-cover harness · IPR valve · Fuel bowl seal kit
• Related: Buying a used 6.0 Powerstroke · How we verify and tag facts

Sources. NHTSA owner complaints database (US government public domain), keyword-matched, limited to complaints that plausibly involve the diesel and do not name the 6.0 or 6.4; owner quotes are taken from complaint narratives with capitalization normalized, and complaint numbers are given so you can read them in full. NHTSA recall records 07V-553 and 09V-399. Ford bulletins 032148, 031410, 03192 and 032151 from NHTSA's manufacturer communications index. Engine hardware by build era from the platform record. Part prices are list prices at the time of publication. Torque Index aggregates and cross-checks public information, takes no paid placement and does not provide repair or inspection services.

Going to see one? Take the Ford 7.3L Power Stroke Diesel buyer's checklist: every documented failure of this engine in inspection order, printable, with repair budgets.