ASE P2 Automobile Parts Specialist cheat sheet

VIN position 10 encodes the model year; letters I, O, Q, U, Z and digit 0 are not used, and the code repeats on a 30-year cycle.

VIN positions 1-3 are the World Manufacturer Identifier (WMI); positions 4-8 are the vehicle attributes section; positions 12-17 are the sequential serial number.

Engine displacement conversion: cubic inches x 16.387 = cubic centimeters; cc / 16.387 = cubic inches (e.g., 350 ci = 5735 cc, commonly rounded to 5.7 L).

SAE oil viscosity is written as two numbers (e.g., 5W-30): the number before W is the cold-crank rating, the number after W is the kinematic rating at 100 C.

DOT brake fluid grades: DOT 3 minimum dry boiling point 205 C, DOT 4 minimum 230 C, DOT 5.1 minimum 260 C; DOT 5 is silicone-based and is not interchangeable with glycol fluids.

Automotive fuses are color-coded by amp rating: 2A gray, 3A violet, 5A tan, 7.5A brown, 10A red, 15A blue, 20A yellow, 25A clear, 30A green.

Wheel bolt patterns are described by number of lugs and bolt-circle diameter in millimeters (e.g., 5 x 114.3); offset is the distance from the hub mounting face to the wheel centerline.

Tire size P225/60R16 decodes as passenger (P), section width 225 mm, aspect ratio 60 percent, radial construction, 16-inch rim; load index and speed rating follow the size.

Serpentine belt length is measured along the belt's outside circumference; a worn belt is replaced by length and rib count, not by vehicle model alone.

Gross margin percent = (selling price - cost) / selling price x 100; markup percent = (selling price - cost) / cost x 100.

A 40 percent margin on a $60 cost yields a $100 selling price; the same item at 40 percent markup sells for $84.

Price lining groups inventory into fixed price points (good/better/best) so customers compare within a tier rather than across all SKUs.

Cross-selling pairs a complementary item with the primary purchase (brake pads with rotors); upselling moves the customer to a higher-tier version of the same item.

Core charges are refundable deposits on remanufactured parts; the customer gets the core credit only when the old unit is returned in rebuildable condition.

Special-order parts typically require a non-refundable deposit because they cannot be returned to the supplier once ordered.

The Magnuson-Moss Warranty Act prohibits a new-car dealer from voiding the warranty solely because a customer used aftermarket parts, unless the part caused the failure.

Counter sales should verify fitment with VIN or engine/trim data before finalizing; a part that fits the model year may not fit the engine or trim variant.

A loss-leader is an item priced below normal margin to drive traffic; it is only viable when attached sales offset the reduced margin.

Inventory turnover = cost of goods sold / average inventory value; higher turns generally mean less capital tied up in stock.

Average inventory = (beginning inventory + ending inventory) / 2 for a period.

Days of supply = 365 / annual inventory turnover; it estimates how long current stock will last at the present sell rate.

Reorder point = (average daily usage x lead time in days) + safety stock.

Economic order quantity balances ordering cost against carrying cost; carrying cost typically runs 20-30 percent of part value per year.

ABC classification: A items are high-value/high-velocity (tight control), B items are moderate, C items are low-value/slow (looser control, larger order quantities).

Obsolescence is identified by no-sales-within-X-months plus no pending demand; it is cleared through return-to-vendor programs, discounts, or write-downs.

Perpetual inventory systems update stock counts at each transaction; periodic systems reconcile by physical count at set intervals.

Fill rate = units shipped / units ordered x 100; it measures how often demand is met from stock without backorder.

A repair order must document customer concern, cause, correction, parts used, labor, and authorization signature to be enforceable.

Labor time guides (flat-rate) quote a standard time per operation; the technician is paid that time regardless of actual clock time, and the customer is billed accordingly.

A shop's effective labor rate = total labor sales / total flat-rate hours sold; it differs from the posted door rate when discounts or comebacks occur.

Comeback rate = vehicles returned for the same concern / total vehicles serviced x 100; it is a key quality metric for the parts and service operation.

Warranty on parts typically covers defects in materials/workmanship; labor reimbursement depends on the supplier's policy and must be stated at the counter.

Handling a complaint follows a sequence: listen without interruption, restate the concern, verify the facts, propose a resolution, and confirm agreement.

The three C's of a service write-up are complaint (customer's words), cause (technician's finding), and correction (what was done).

Technician certification levels (ASE) and shop certifications are selling points; the parts specialist should know which certifications the shop advertises.

Special-order and non-returnable parts should be disclosed to the customer in writing before the repair is authorized to avoid billing disputes.