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Ford Focus Engine Camshaft Position Sensor Magnets

Ford Focus Engine camshaft position sensor magnets

Starting at $57.95, AutoBuffy stocks 1 engine camshaft position sensor magnets from Standard Ignition. This small magnet mounts to the camshaft or reluctor ring and generates the signal the cam position sensor reads to track valve timing. When it corrodes, cracks, or loses magnetism, the ECU loses accurate timing data, triggering misfires, rough running, and fault codes that can disable your Ford Focus.

Signs your Ford Focus needs a new camshaft position sensor magnet

  • Check Engine light on with stored codes P0340–P0349 (camshaft position sensor circuit fault)
  • Hard start or extended cranking because the ECU cannot confirm cam position for fuel and ignition timing
  • Random misfires or rough idle caused by incorrect valve-timing signals reaching the engine control module
  • Hesitation or stumble under acceleration as timing corrections chase a corrupted cam signal
  • Engine stalls unexpectedly, particularly at low RPM or immediately after a cold start
  • Failed emissions test due to incomplete readiness monitors caused by persistent cam sensor faults

Which camshaft position sensor magnet should you buy for your Ford Focus?

The main decision is whether to match OE material and field strength or upgrade to a more corrosion-resistant design. Because this magnet must produce a precise, consistent magnetic field at operating temperature, field strength and dimensional accuracy matter more than price. Confirm the mounting style and pole count required by your Ford Focus's cam sensor before ordering.

OE-Replacement (standard ferrite)
Best for
Daily drivers, exact stock restoration
What you get
Factory field strength, confirmed fitment, direct plug-and-play with existing sensor
High-Temp Ceramic Magnet
Best for
High-performance or turbocharged engines with elevated underhood heat
What you get
Greater thermal stability, reduced risk of demagnetization at sustained high temperatures
Neodymium (rare-earth) Upgrade
Best for
High-RPM applications needing a stronger, sharper signal
What you get
Higher magnetic flux for cleaner sensor output; verify sensor compatibility before installing
Magnet + Reluctor Ring Kit
Best for
Heavily corroded or damaged reluctor rings alongside a failed magnet
What you get
Complete signal-generating assembly replaced at once, eliminating repeat labor for related failures

Engine camshaft position sensor magnets brands we stock for your Ford Focus

Standard Ignition
1 option · from $57.95

Replacing the camshaft position sensor magnet on a Ford Focus

Moderate⏱ 1–2 hoursSocket set and ratchetTorx or hex bit set (for timing cover or sensor bracket fasteners)Plastic pry tool or magnet pick-up toolGasket scraper or clean rag for sealing surfacesScan tool for clearing codes and verifying signal after repair

Access to the camshaft position sensor magnet typically requires removing any covers, brackets, or components blocking the cam sensor mounting location, then extracting the old magnet from its seat or pressing it free from the reluctor ring. Seat the new magnet fully and squarely, reinstall all fasteners to a snug, even torque following the factory sequence, and clear stored fault codes before test-driving to confirm the repair.

Frequently asked questions

How much does it cost to replace camshaft position sensor magnets on a Ford Focus?
The part itself starts at $57.95 on AutoBuffy. Total cost depends on whether you DIY or use a shop. Professional labor adds one to two hours of shop time on most engines, more if the cam sensor or reluctor ring must also be replaced. Doing it yourself keeps the cost close to the part price alone.
Can I drive my Ford Focus with a bad camshaft position sensor magnet?
Short trips may be possible if the engine still starts, but driving is not recommended. A degraded magnet produces an erratic cam signal that forces the ECU to run in limp mode or use fallback timing tables, reducing power, increasing fuel consumption, and potentially causing catalytic converter damage from sustained misfires.
Will replacing just the magnet fix a P0340–P0349 code on my Ford Focus?
It depends on the root cause. If the magnet is cracked, corroded, or has lost field strength, replacing it resolves the code. However, if the sensor itself, wiring harness, or reluctor ring is also damaged, those components need attention too. Inspect all three before assuming the magnet alone is at fault.
How do I know if the camshaft position sensor magnet is the problem and not the sensor itself?
Use a scan tool to monitor live cam sensor data while cranking. If the sensor produces no signal or an intermittent one, test the magnet with a separate gaussmeter or compare it to a known-good part. A visibly cracked, chipped, or heavily corroded magnet is a clear indicator it needs replacement.
How long does a camshaft position sensor magnet last on a Ford Focus?
On most vehicles the magnet lasts the life of the engine under normal conditions, but heat cycling, coolant exposure, and physical contact with debris can accelerate failure. Engines with high mileage or a history of overheating are more likely to experience magnet degradation. Inspect it any time the cam sensor or timing cover is removed.
Does the camshaft position sensor magnet need to be timed or indexed when installed?
On most designs the magnet is press-fit or bolted to a fixed location on the camshaft or reluctor ring, so precise rotational indexing is not required beyond seating it fully and squarely. Always confirm the specific orientation requirements for your Ford Focus's engine family before installation, as some applications are position-sensitive.

Shop engine camshaft position sensor magnets by year for the Ford Focus

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