You start your car and the engine cranks fine, but it stumbles, misfires, or refuses to fire at all. The check-engine light flickers on, and the scan tool spits back a P0340 or P0341 code. That points to the camshaft position sensor — a small electronic component that tells your engine’s computer exactly where the camshaft is at all times. When it fails, your engine literally can’t time fuel injection or ignition correctly. The good news: the camshaft position sensor replacement cost is one of the cheaper drivability fixes you’ll see. The bad news: ignore it long enough, and a stuck or misfiring engine can damage the catalytic converter, fuel injectors, or pistons — turning a $250 repair into a $3,000 nightmare.

What Does the Camshaft Position Sensor Actually Do?

Modern gasoline and diesel engines rely on extremely precise timing. The engine control module (ECM) needs to know two things at every moment: where the crankshaft is (provided by the crankshaft position sensor) and where the camshaft is (provided by the camshaft position sensor). Together, those readings tell the ECM which cylinder is on its compression stroke, when to fire the spark plug, and when to pulse the fuel injector.

The sensor itself is usually a small Hall-effect or magnetic-pickup device mounted to the cylinder head, valve cover, or timing cover. It reads a reluctor ring or notched tab on the camshaft as it spins. The signal it produces is sent dozens of times per second to the ECM. When the sensor drifts out of tolerance — or stops sending a signal altogether — your engine loses one of its two primary timing references and the ECM has to guess or shut things down.

Symptoms of a Failing Camshaft Position Sensor

Most owners notice one or more of the following before the check-engine light even comes on:

• Hard starting or no-start condition — the ECM can’t verify cam position, so it delays or cancels spark and fuel.
• Random misfires — particularly under load, on hills, or during acceleration.
• Stalling at low speeds or at idle, especially after the engine warms up.
• Reduced power and rough idle — the ECM may drop into limp mode to protect the engine.
• Poor fuel economy — injectors are being pulsed at the wrong time.
• Check-engine codes P0340, P0341, P0345, P0346, P0365, or P0390 (range and circuit faults for cam sensor banks).

How Much Does Camshaft Position Sensor Replacement Cost in 2026?

Across most makes and models, you’re looking at a total bill of $180 to $475, with the average landing around $310. The wide range is driven by labor: the sensor itself is rarely more than $90–$160 for a quality OEM-grade part, but some V6 and V8 engines bury the sensor behind the intake manifold or timing cover, which can push labor past two hours.

Cost by Make and Model

Sensor placement and parts pricing vary dramatically between brands. Here’s what owners are actually paying for the job in 2026:

Vehicles with two banks (V6, V8) often have two camshaft position sensors. If both are throwing codes, expect to roughly double the part cost — though labor doesn’t scale evenly because the shop is already in there.

What Drives the Price Difference?

1. Where the sensor sits on the engine

Inline-four engines with the sensor near the top of the cylinder head are the easiest. A tech can pop the sensor in 15 to 30 minutes. V6 and V8 engines with rear-mounted sensors, or sensors hidden under the intake manifold, can take 90 minutes to 3 hours. Some European engines require partially disassembling the timing cover to access them.

2. OEM vs. aftermarket part

For most domestic and Asian vehicles, a quality aftermarket sensor from Bosch, Delphi, NGK, or Denso performs identically to OEM at a third of the price. For German cars and certain hybrid powertrains, the OEM part is almost always worth the extra money — cheap aftermarket sensors on these engines tend to throw intermittent codes within months.

3. Whether you have one sensor or two

V-engines and dual-overhead-cam four-cylinders usually have one sensor per bank or per cam. If only one has failed, replacing just that one is fine. If your engine has high mileage and one has failed, many techs recommend replacing both at the same time since the labor overlap saves you money down the road.

4. Diagnostic complexity

Cam position codes can sometimes be caused by a worn timing chain, stretched timing belt, failed VVT solenoid, or even a wiring harness issue rubbed through by engine vibration. A good shop will scope the sensor signal before condemning the part. Expect a diagnostic fee on the higher end if the symptoms are intermittent.

Can I Drive With a Bad Camshaft Position Sensor?

Technically, yes — many modern engines will limp home using the crankshaft sensor signal alone. But you shouldn’t make a habit of it. Driving with a failing cam sensor can cause:

• Catalytic converter damage from raw fuel dumping past misfiring cylinders — a $1,500–$3,500 replacement on most vehicles.
• Fouled spark plugs and coil packs from incomplete combustion.
• Carbon buildup in direct-injection engines, which can require an intake cleaning service ($350–$700).
• Sudden stalls in traffic — a real safety risk on highways.

If you’re reading P0340-series codes, get the sensor replaced within a week or two. It’s a quick fix that prevents expensive cascade damage.

DIY vs. Professional Replacement

For sensors mounted on top of the valve cover or cylinder head — common on Honda, Toyota, Nissan, and many Ford four-cylinders — a careful home mechanic can swap the part in under an hour with basic hand tools. You’ll need a torque wrench (the bolt is small but easy to overtighten), the correct replacement sensor, and an OBD-II scanner to clear codes.

For sensors buried under the intake manifold, hidden behind the timing cover, or located on the back of a V-engine bay, the DIY savings disappear quickly. You’re looking at hours of work, the risk of breaking brittle plastic intake components, and the chance of mis-routing a wiring harness. For those installs, a shop is the smarter call.

How Long Should a Camshaft Position Sensor Last?

Most factory cam sensors are designed for the life of the engine, but real-world failure rates climb noticeably after the 100,000-mile mark. Heat cycling, vibration, and oil contamination from a leaking valve cover or timing cover gasket are the most common killers. If your vehicle is past 100K miles and you’ve had any oil leaks near the sensor, it’s living on borrowed time.

Does an Extended Warranty Cover the Camshaft Position Sensor?

Yes — on most comprehensive (also called “bumper-to-bumper”) and stated-component extended warranty plans, the camshaft position sensor is a covered electronic component. Powertrain-only plans sometimes include it because the sensor is essential to engine operation, but coverage depends on the specific contract wording.

With an Empire Auto Protect plan, here’s how it works: when your sensor fails, you take the vehicle to any ASE-licensed shop nationwide, the shop diagnoses the problem, and we pay them directly — minus your chosen deductible (between $0 and $200). The repair you would have paid $310 for becomes a $100 visit or less, depending on plan.

Frequently Asked Questions

Is replacing a camshaft sensor an emergency?

Not usually an immediate emergency, but it should be handled within a week to avoid misfire damage to the catalytic converter and ignition components. If the car is stalling in traffic, treat it as urgent and avoid highway driving until it’s fixed.

How long does the replacement take at a shop?

Anywhere from 30 minutes to 3 hours depending on engine layout. Most four-cylinder Hondas, Toyotas, and Nissans are done in under an hour. Mercedes V6s and Audi 2.0T engines can take 2 to 3 hours because of intake or cover removal.

Will the check-engine light reset itself after replacement?

Sometimes, but the safer bet is to have the shop clear the code with a scan tool after the new sensor is installed. The ECM will then complete its readiness monitors over the next 50 to 100 miles of normal driving.

Can a bad cam sensor cause transmission problems?

Indirectly, yes. Most modern automatic transmissions take input from the ECM to coordinate shifts. A misfiring engine or limp mode caused by a cam sensor fault can produce harsh or delayed shifts. Once the sensor is fixed, the shifting typically returns to normal.

What’s the difference between a crankshaft position sensor and a camshaft position sensor?

The crankshaft sensor tells the ECM how fast the engine is spinning and where the pistons are. The camshaft sensor tells the ECM which stroke each cylinder is on (intake, compression, power, exhaust). Both are required for fuel injection and ignition timing, and either can throw similar drivability symptoms when they fail.

The Bottom Line

A camshaft position sensor is one of the more affordable fixes on a modern engine, with most repairs landing between $180 and $475 in 2026. The part is small, but its job is huge: every fuel injection event and every spark depends on it. Catch it early and you’re out a couple hundred dollars. Ignore it and you can be looking at a fried catalytic converter, fouled coils, or a tow bill.

If you’re out of factory warranty — or driving a high-mileage vehicle where small electronic failures keep adding up — an extended warranty from Empire Auto Protect can absorb the cost of cam sensors, MAF sensors, ignition coils, fuel injectors, and hundreds of other parts that wear out in the second hundred thousand miles.

By the Empire Auto Protect Team | Updated May 2026