Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2004 Toyota Land Cruiser?

• Typical diagnostic fees range from $79 to $129 depending on the tests required; some promotions may reduce or waive this fee.
• Nalley Toyota of Roswell often costs less than independent shops while delivering factory-trained technicians, reducing immediate out-of-pocket cost.
• Doing diagnostics and repairs at our dealership produces long-term savings through accurate repairs, OEM parts and fewer repeat visits.
• Any repairs covered under warranty must be completed at a certified dealership to preserve coverage and ensure proper parts and labor tracking.

What does it mean when the check engine light comes on in a 2004 Toyota Land Cruiser?

• It signals the vehicle’s computer detected a fault — anything from a loose gas cap to an engine misfire or emissions control issue.
• Common causes include oxygen sensor faults, catalytic converter degradation, EVAP leaks, misfires, or fuel-trim irregularities.
• Some issues affect emissions only; others can cause drivability problems or engine damage if ignored.
• Our technicians use manufacturer-grade scanners to identify the exact code and recommend repairs that save money and extend vehicle life.

What is the first thing to check when the check engine light comes on?

• Check the gas cap for tightness — a loose or damaged cap is a common, inexpensive cause and can clear the code after a few drives.
• Observe dashboard behavior: reduced power, strange noises, or rough idling indicate a more serious issue requiring immediate inspection.
• Review basic maintenance: oil level, coolant, and recent fuel quality can reveal simple causes you can address quickly.
• If uncertainty remains, bring the vehicle to Nalley Toyota of Roswell for a professional scan and clear guidance from certified technicians.

What is the most common reason for check engine light on a 2004 Toyota Land Cruiser?

• One of the most frequent causes is oxygen sensor failure or degradation, which affects fuel economy and emissions.
• Other top reasons include loose gas caps, EVAP system leaks, misfires from spark plugs or ignition components, and catalytic converter issues.
• Addressing these early at our dealership often costs less than independent shops and prevents costly downstream repairs.
• Warranty-covered repairs must be completed at a certified dealer to ensure coverage and proper use of OEM components.

How long does a check engine light service take?

• Diagnostic scanning and an initial inspection typically take 30–90 minutes, depending on the codes found.
• Minor repairs such as gas cap replacement or sensor swaps are often completed same day.
• Complex repairs that require parts ordering or extensive labor may take one to several days; we communicate timelines and options clearly.
• Using Nalley Toyota of Roswell gives immediate and long-term savings through efficient diagnostics, OEM parts, and factory-trained technicians who get it right the first time.