20% OFF $150+ orders using code: LEAF20 Online, Ship to Home orders only. Max discount of $50. Valid 10/9 – 10/13/2025. Shop Now | Get Details
How To: Vehicle Troubleshooting Techniques
Whether your check engine light just came on or your brakes don’t feel quite right, knowing where to start can save you time, money, and stress. Our guide walks you through how to troubleshoot and offers tips to help you avoid future issues.
Unusual noises, rough idling, and dashboard warning lights are often early signs of engine or transmission problems. Catching these early can prevent major breakdowns.
Remove gears, pulleys, and other press-fitted parts during repairs.
Lighting & Electrical Issues
Flickering headlights or malfunctioning interior electronics may point to battery, wiring, or fuse-related problems. Electrical glitches are often early warnings of larger failures.
These tools help ensure secure, clean wiring for sage and reliable repairs or installations.
Braking System Concerns
Squealing, grinding, or a soft brake pedal can signal worn pads, low fluid, or air in the lines. Ignoring brake issues risks safety and more costly repairs down the road.
O'Reilly Automotive, Inc. | 233 S. Patterson, Springfield, MO 65802 | 1-888-327-7153
20% off $150+: Valid on regularly priced in-stock items for Ship to Home orders that when purchased together total $150 or more (before tax, shipping and discount) on the OReillyAuto.com website only. Excludes AIRAID, B&M, Bully Dog, DeVilbiss, Edelbrock, Flowmaster, Holley, Hurst, Ingersoll-Rand, K&N, MSD, SCT, and Spectre items.
To Redeem Offer: Add qualifying items totaling $150 or more to your shopping cart and select “Ship” as your delivery method. Enter promo code LEAF20 in the cart. The total in your shopping cart will be adjusted after promo code is applied. Excluded brands contribute toward minimum purchase amount to qualify for offer but are not eligible for discount. (Maximum $50.00 Discount.) Valid Thursday, October 9th to Monday, October 13th, 2025 (11:59pm Hawaii Time Zone). Coupon code is not redeemable for cash, is nontransferable and cannot be replaced if lost or stolen. Not valid on same-day delivery orders. Void if copied, transferred or where prohibited by law. Customer pays sales tax and shipping fees.
Offer subject to adjustment due to returns, cancellations and exchanges. Additional taxes and duties may apply. Not valid with any other promotional gift with purchase. Offer may be modified or discontinued at any time without notice.
Offer Terms: Offer does not apply to gift card orders. Offer does not apply to Lead-Acid batteries. Cannot be used in combination with any other certificates, offers, or discounts or for payment on account. Not valid on previous purchases or store purchases. Shipping & handling and taxes do not qualify towards the minimum purchase. Valid for retail customers only. OReillyAuto.com only ships orders within the U.S.
Excluded Brands: Offer does not apply to AIRAID, B&M, Bully Dog, DeVilbiss, Edelbrock, Flowmaster, Holley, Hurst, Ingersoll-Rand, K&N, MSD, SCT, and Spectre items.
