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[terry paget]

The crank sensor I just replaced was the original and had lasted 15 years / 175k miles. It did better than most I think.

I can't see why they should ever fail. I imagine each sensor is a single coil in a casing, with cable attached, leading to a connector at the other end  What's to go wrong? It's also strange that V6 cam sensors never seem to fail, but 4 cylinder cam sensors fail for a a pastime. They have no moving parts, nothing to wear out. I suppose wires carrying currents may wear out, and soldered and crimped connections work loose.

Once again, a car is designed to last 7 years without trouble, and usually does. After 15 years, well, who knows?

[Nick W]

The crank sensor I just replaced was the original and had lasted 15 years / 175k miles. It did better than most I think.

I can't see why they should ever fail. I imagine each sensor is a single coil in a casing, with cable attached, leading to a connector at the other end  What's to go wrong? It's also strange that V6 cam sensors never seem to fail, but 4 cylinder cam sensors fail for a a pastime. They have no moving parts, nothing to wear out. I suppose wires carrying currents may wear out, and soldered and crimped connections work loose.

Terry, they are a coil of extremely fine wire, potted in a case and bolted to an engine that vibrates terribly all the time it's running. It's a wonder they last as long as they do! And it's also the reason why cheap ones are such a gamble: they're utterly dependent on high quality materials, manufacturing processes and quality control - which are the first three things to compromise when you want to cut costs.

[TheBoy]

Yes, but you get about a tenth of the reasonable life of brake pads so the part is not the problem

Is it possible to be hard on cranksensors

[Nick W]

Yes, but you get about a tenth of the reasonable life of brake pads so the part is not the problem

Is it possible to be hard on cranksensors

Asks a man who has had to fit three to the same car

[TheBoy]

Yes, but you get about a tenth of the reasonable life of brake pads so the part is not the problem

Is it possible to be hard on cranksensors

Asks a man who has had to fit three to the same car

Mrs TB was driving it when it went at the NEC.  So there, its all her fault. Yeah.  That's that sorted then

[Migv6 le Frog Fan]

The crank sensor I just replaced was the original and had lasted 15 years / 175k miles. It did better than most I think.

I can't see why they should ever fail. I imagine each sensor is a single coil in a casing, with cable attached, leading to a connector at the other end  What's to go wrong? It's also strange that V6 cam sensors never seem to fail, but 4 cylinder cam sensors fail for a a pastime. They have no moving parts, nothing to wear out. I suppose wires carrying currents may wear out, and soldered and crimped connections work loose.

Once again, a car is designed to last 7 years without trouble, and usually does. After 15 years, well, who knows?

Its actually the wiring which fails, due to the fact it spends its life about a quarter of an inch from the exhaust manifold. The heat eventually makes the wire brittle and it breaks down.
That's  why its sensible to reroute the cable up behind the brake pipes on the inner wing when replacing the sensor.