AN INSIDE LOOK AT WHAT CAUSES CRANK SENSORS TO GO BAD
                     AN INSIDE LOOK AT WHAT CAUSES CRANK 
SENSORS TO GO BAD
Paul Norman Jasper
Writer at autopartsu.com whose favorite topics 
include,  best replacement radiators and
 radiator replacement advice.
The crank sensor in your vehicle will not last forever. However, extensive use 
across hundreds of thousands of miles is not the sole reason for crank sensor 
malfunction. There are all sorts of different reasons why these sensors 
eventually go bad. Below, we delve into the top causes of crank sensor 
malfunction and explain why this essential vehicle component is so 
important.
On combustion, the spark plug sparks and causes an explosion in the cylinder, 
pushing the piston back down. On the compression and combustion strokes, 
the intake valves are moving to their closed position and the exhaust valves 
are opening to allow the results of the explosion to leave through the 
exhaust. On the exhaust stroke, the piston pushes the used gas and air out 
through the exhaust valves and through the exhaust system.
TIMING
Since two solid objects cannot occupy the same space at the same time, the 
valves have to close as the piston rises. The camshaft sensor tells the 
computer where in the process the camshaft is. The crankshaft sensor tells 
the computer where in the process the crankshaft is. The computer uses the 
signals from both sensors — or either, if a vehicle has one or the other — to 
determine several pieces of information the engine needs to run efficiently, 
including the speed of the engine (rpm), which in turn tells the computer to 
open or close the fuel injectors for more or less fuel.
CAMSHAFT SENSOR LOCATIONS
The camshaft sensor is usually located near the top of the engine. It might be 
on the top of the block, on one or both heads, or on the intake manifold, 
usually near the timing cover. In some cases, you might find the camshaft 
sensor behind the timing cover. If the camshaft sensor is on the exterior of 
the engine, it is usually easy to replace.
CRANKSHAFT SENSOR LOCATIONS
The crankshaft sensor is usually located near the bottom of the block, toward 
the front of the engine. In most cases, you’ll find it behind the harmonic 
balancer. In some vehicles, you might find the crankshaft sensor behind the 
timing cover, near the bottom of the block, though this is rare. As long as the 
sensor is on the outside of the block, it is relatively easy to replace.
TIPS FOR REPLACING THE SENSORS
In some cases, a code for a camshaft sensor doesn’t mean the sensor is bad. 
For example, a Dodge Hemi engine has cam phasers on the cam gears, plus a 
cam oil sensor under the intake. If the sensor malfunctions, the computer 
could send a code for the camshaft sensor. In some cases, a crankshaft sensor 
code could mean another problem causing the crank sensor to have an 
incorrect reading.
• Before unplugging the pigtail, check the wiring to make sure that it is in 
good condition. You might have to pull the wiring loom back a little to see a 
good 3 to 4 inches.
• Use a flat head screwdriver to gently pry the plastic locks on the sensor 
away from the pigtail.
• Always pull the pigtail straight out. If it doesn’t want to come off the sensor 
easily, work it back and forth with a gentle motion. You don’t want to damage 
the pins inside.
• Be sure to catch the bolts when you remove them. If they fall into the 
engine compartment or onto the ground, you might not find them. Most 
sensors do not come with new bolts.
Visit Motorad today to learn more about crank and cam sensors and to learn 
where to find quality replacement parts for your vehicle.
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