Estimates last updated October 16, 2025

Mercury Mariner Ignition Lock Cylinder Replacement Cost

The average cost for a Mercury Mariner Ignition Lock Cylinder Replacement is between $206 and $296.

Labor costs are estimated between $73 and $107 while parts are priced between $132 and $188.
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.

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.

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.

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.

RepairPal recommendations for ignition lock cylinder issues

It's best not to force open a stuck lock cylinder at home, as it's easy to damage to the ignition switch, plastic covers or the steering column. Ignition switch wiring is bundled with wiring for the airbags, and tampering with the airbag electrical wiring can result in serious injury.

Can I replace the ignition lock cylinder myself?

This job is best left to a professional repair shop. Newer ignition systems have more advanced security and can be difficult to access or remove.