Learn About Your Car

Are you interested in certification?

Ignition Lock Cylinder Replacement

What is an ignition lock cylinder?

The ignition lock cylinder and ignition switch are two separate components. The lock cylinder is the portion that the key slides into and allows the ignition to turn. This is one of your vehicle's defenses against theft.

How does the ignition lock cylinder work?

If the correct key is inserted, small actuators on the lock cylinder will allow it and ignition switch to rotate.

A broken ignition lock can make it difficult to turn the key.

A failed ignition switch can cause the engine to run even after the key has been removed from the ignition.

Sometimes when there is a problem with the ignition switch, the steering wheel is difficult to lock or unlock.

What are the symptoms related to a bad ignition lock cylinder?

When the ignition switch lock cylinder fails, it can create a situation where the ignition cannot be turned, or takes much wiggling and shaking before it finally turns. Or, it's possible the ignition will turn and run with the key removed, or lets the key be removed in any position. Lastly, the lock can fail to release your key, or not allow the key to travel all the way into the ignition lock cylinder.

Mercury Ignition Lock Cylinder Replacement Cost Estimates

The average cost for a Ignition Lock Cylinder Replacement is between $237 and $338 but can vary from car to car.

Mercury Grand Marquis

Mercury Mountaineer Ignition Lock Cylinder Replacement Cost by Year

The average cost for a Mercury Mountaineer Ignition Lock Cylinder Replacement is between $237 and $338 but can vary from car to car.

2010 Mercury Mountaineer

$227-$320

2009 Mercury Mountaineer

$227-$320

2008 Mercury Mountaineer

$227-$320

2007 Mercury Mountaineer

$227-$320

2006 Mercury Mountaineer

$227-$320

2005 Mercury Mountaineer

$237-$338

More RepairPal Resources

Ignition Lock Cylinder Replacement

Jump to:Commonly associated repairs Cost estimates by vehicle Cost estimates by year

What is an ignition lock cylinder?

How does the ignition lock cylinder work?

If the correct key is inserted, small actuators on the lock cylinder will allow it and ignition switch to rotate.

A broken ignition lock can make it difficult to turn the key.

A failed ignition switch can cause the engine to run even after the key has been removed from the ignition.

Sometimes when there is a problem with the ignition switch, the steering wheel is difficult to lock or unlock.

What are the symptoms related to a bad ignition lock cylinder?

Estimates last updated January 28, 2026

2002 Mercury Mountaineer Ignition Lock Cylinder Replacement Cost

The average cost for a 2002 Mercury Mountaineer Ignition Lock Cylinder Replacement is between $237 and $338.

Labor costs are estimated between $122 and $179 while parts are priced between $115 and $159.
This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
For a more accurate estimate based on your location, use our Fair Price Estimator below.

Can I drive with an ignition lock cylinder problem?

When the ignition lock cylinder is malfunctioning, it may be impossible to insert the key, turn the ignition, or remove the key from the ignition. If the key won't go in or turn, you won't be able to drive the car, obviously. If the key won't come out, theft is a major concern. Either way, you'll want this fixed quickly.

How often do ignition lock cylinders need to be replaced?

Theres no set maintenance routine for the ignition lock cylinder. Lock cylinders fail somewhat commonly, but mostly for higher-mileage vehicles. Most vehicles will never need the lock cylinder replaced. You can help yours last by cleaning your ignition key, making sure there's no lint on it before putting it in the ignition, and keeping your keychain fairly light, so as not to put added pressure on the cylinder while you drive.

How are ignition lock cylinder issues diagnosed?

If the ignition key stops working, or won't come out of the cylinder, the ignition lock cylinder is usually the culprit. A mechanic can confirm it's the problem after disassembling it.

How is an ignition lock cylinder replaced?

In most cases, the steering column plastic covers will be removed, and the ignition lock cylinder will be turned and released. A new cylinder will be installed, which usually will come with a new key.

Get a RepairPal Fair Price Estimate® for your 2002 Mercury Mountaineer.

Our Fair Price Estimate will help you avoid overpaying based on your car, needed service, and labor rates in your area.