📋 Recommended Interval
Miles
15,000–30,000 miles
Time
2 years
DIY Cost
$15–$30
Shop Cost
$30–$80
Use whichever comes first, miles or time. Severe service (short trips, towing, dust, extreme heat or cold) shortens the safe interval by 25–50%.
🧠 Why This Interval Matters
A clogged air filter restricts intake, which hurts MPG by 1–3% and richens the mixture. On modern turbocharged engines it can also cause boost lag and elevated EGTs. It's a 5-minute fix, almost no reason to skip.
⚠ Signs You're Overdue
- Filter looks gray, black, or has visible debris
- MPG dropped 1–2 mpg recently
- Engine feels sluggish at full throttle
- Check engine light with P0171 or P0174 (lean) codes
- You can't remember the last replacement
What happens if you skip itLow. Won't damage the engine quickly, but costs MPG and can cause limp mode in extreme cases.
💵 DIY vs Shop Cost
DIY
$15–$30
Shop
$30–$80
Difficulty
Easy
Shop pricing varies by region and vehicle. Independent shops are typically 25–40% cheaper than dealerships for the same work. DIY assumes you have basic hand tools.
🛒 Related Items & Typical Life
| Item | Typical Life | Replace Cost |
|---|---|---|
| Engine air filter | 15,000–30,000 mi | $15–$30 |
| Cabin air filter (separate) | 15,000–30,000 mi | $15–$30 |
| MAF sensor cleaner (with filter) | Every 30,000 mi | $8–$15 |
🔗 Related Guides
❓ Frequently Asked Questions
Can I clean a paper air filter?
No, tapping it out removes loose dust but the trapped fine particles stay. Just replace it. Reusable oiled filters (K&N type) can be washed and re-oiled, but follow the kit instructions.
Aftermarket performance filters worth it?
For most cars, no measurable HP gain. They flow more air but also more dust. Stick with OEM unless tuning.
What's the difference between engine and cabin filters?
Engine filter cleans intake air for combustion. Cabin filter cleans air for the HVAC system you breathe. They're separate parts.
How do I check the filter myself?
Open the airbox (usually a few clips or screws), pull the filter, hold it up to a light. If light barely passes through, replace.
Does a dirty filter cause check engine light?
Indirectly. Severe restriction can cause lean codes (P0171/P0174) or MAF discrepancies.
Do dealerships overcharge for this?
Often. The filter is $15 and the labor is 5 minutes. DIY makes sense for almost everyone.