ASE C1 Cheat Sheet 2026

The 20 highest-yield ASE C1 facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. For a warranty claim to be accepted, what should the repair order clearly document? → The customer's concern, the cause found, and the correction performed
2. After rotating the tires on a vehicle whose TPMS displays the pressure at each individual wheel position, what follow-up step may be required? → Perform a TPMS sensor relearn so the system knows each sensor's new location
3. A customer looks at an estimate and says, "That's way too expensive." What is the service consultant's best first response? → Acknowledge the concern and ask questions to learn what is behind the objection
4. To schedule appointments so the shop is neither overbooked nor underused, the consultant should base the daily schedule mainly on: → Available technician hours compared with the estimated labor time of the booked jobs
5. A vehicle at 25,000 miles is still under its 3-year/36,000-mile basic warranty. Which repair would most likely be customer-pay? → Replacing worn front brake pads
6. A customer's tire sidewall reads P215/65R16 98H. What does the number 65 represent? → The aspect ratio: sidewall height as a percentage of tread width
7. A warranty claim needs the vehicle's month and year of manufacture. Where is this information most reliably found? → The safety certification label on the driver's door jamb or B-pillar
8. Which VIN character tells a service consultant the country where the vehicle was manufactured? → The 1st character
9. A customer with a front-wheel-drive car complains of a rhythmic clicking noise during sharp turns while accelerating. Which component is the most likely cause? → Outer constant-velocity (CV) joint
10. A customer wants to know if their used vehicle has any open safety recalls. Which source lets the consultant check this by the vehicle's VIN? → The NHTSA recall lookup or the manufacturer's dealer recall system
11. During write-up, which piece of customer information is most important to confirm so the shop can reach the customer for authorization? → The customer's best phone number and preferred contact method during the day
12. A customer reads the VIN to a service consultant over the phone and says one of the characters is the letter "O." What should the consultant conclude? → The character is really a zero, because I, O and Q are not used in VINs
13. A hybrid customer asks what the bright orange cables under the hood are. What is the best explanation? → They are high-voltage cables that only trained technicians should handle
14. A consultant sees at 2:00 p.m. that a vehicle promised for 4:00 p.m. won't be finished until tomorrow. What is the best course of action? → Call the customer right away, explain the reason and give a realistic new completion time
15. What is the main purpose of a follow-up call a few days after a customer's vehicle was repaired? → To check whether the customer is satisfied and find any unresolved problems early
16. A customer wants to wait at the dealership while the work is done. Which service is best suited to a waiter appointment? → An oil change and a multipoint inspection
17. A customer is booking a recall check, and the service consultant needs the vehicle's model year. Which VIN position should the consultant look at? → 10th character
18. Before getting a customer's authorization for repairs, what should the service consultant make sure the customer understands about the estimate? → The total estimated cost, including parts, labor, and any fees or taxes
19. On a part-time or full-time four-wheel-drive truck, which component splits engine power between the front and rear drive axles? → Transfer case
20. Which job should normally go to the shop's most experienced diagnostic technician? → An intermittent no-start with no stored diagnostic trouble codes