Aaron has run his shop in Portland's Cully neighborhood for ten years. One bay, two techs, the standard mix of Subarus, Toyotas, and the occasional electric vehicle whose 12-volt accessory battery has decided to die. Aaron does not have an Oregon state license to display because Oregon does not license auto repair shops. What Aaron has is the obligation, under ORS §§646A.480-646A.495, to follow specific disassembly and authorization procedures that have unusual teeth in transmission and engine-rebuild contexts.

The job in question started routinely. A 2014 Subaru Outback, Continuously Variable Transmission, customer reporting unusual whining and slip when accelerating. Aaron quotes the customer $180 to perform a road test, scan the transmission control module, and provide a diagnostic recommendation. The customer agrees verbally and drops the keys. The road test confirms the symptoms. The scan shows multiple solenoid codes. Aaron's tech recommends a transmission teardown to inspect the valve body and the chain, which requires removing the transmission from the vehicle, disassembling the case, and inspecting the internal components. The teardown will cost approximately $850 in labor. If the chain or valve body is found defective, the rebuild cost — including parts, machining, and reassembly — could exceed $3,500.

Aaron calls the customer. The customer says, "Go ahead, do whatever it needs to figure out the problem." Aaron's tech proceeds with the teardown. Six hours of labor later, the transmission is on the bench in pieces. The valve body is confirmed defective. Aaron's tech prepares a part-and-labor estimate for the rebuild: $3,400. Aaron texts the estimate to the customer and asks for authorization to proceed with the rebuild. Twenty minutes later, the customer's voicemail comes back: "Do not reassemble. I'm taking the car to a different shop."

Aaron is now holding a Subaru with a transmission in pieces on his bench. He has $200 of authorized evaluation work, $850 of additional teardown work the customer verbally authorized, and a customer who has refused authorization for both the rebuild AND the reassembly. Aaron consults ORS §646A.486 and discovers two things he did not previously know.

What ORS §§646A.480-495 actually requires (and the trap)

The Oregon Vehicle Repair Shop statutes were amended substantially in 2010 and 2017 to include some of the most prescriptive evaluation-and-reassembly provisions in the United States. The current version requires:

  • Written estimate before any work begins — a vehicle repair shop shall prepare an estimate of the cost of work the shop proposes to perform on a motor vehicle before beginning the work. The estimate must divide the work into separate tasks to the extent possible, include the estimated cost of labor and parts, and provide the total estimated cost (which may consist of a reasonable range).
  • The $200 evaluation cap — a vehicle repair shop may not take any action to evaluate the condition of a motor vehicle if the action will cost the owner more than $200, except as the statute permits. (ORS §646A.486.) Translation: any disassembly, teardown, or invasive evaluation that will cost more than $200 requires customer authorization in writing or by recorded oral consent BEFORE the action is taken.
  • Separate disassembly and reassembly estimates required — when the shop proposes to disassemble or remove parts to evaluate the condition of the motor vehicle, the estimate must list the total estimated cost of performing the disassembly and evaluation AND a separate estimate for reassembly, AND state the estimated amount of time to reassemble the motor vehicle. (ORS §646A.482(2)(c).)
  • Authorization to exceed the estimate — if actual costs will exceed the estimated total by more than the percentage specified in the statute, the shop must obtain additional authorization from the owner or the owner's designee before performing the additional work.
  • Customer's right to receive estimate and invoice — the shop must provide a copy of the estimate (as a separate document or in the form of an invoice) to the owner not later than before receiving final payment.

The two facts Aaron discovers when he reads the statute, with the transmission already in pieces:

Fact one: the $850 teardown was unauthorized in the statutory sense. The customer's verbal "do whatever it needs" did not authorize a specific dollar amount in excess of the $200 evaluation cap. ORS §646A.486 requires a specific authorization for evaluation work above $200, in writing or with documented oral consent. "Do whatever it needs" does not specify a dollar amount and does not satisfy the statute.

Fact two: Aaron should have provided a separate reassembly estimate up front. ORS §646A.482(2)(c) required that, when Aaron proposed disassembly, his estimate include the cost of the disassembly AND a separate estimate for the cost to reassemble the transmission if the customer chose not to proceed with the rebuild. Aaron did not provide a separate reassembly estimate. Now, with the transmission in pieces and the customer refusing the rebuild, Aaron is in a position where the customer can argue that any reassembly cost was not authorized — because the original authorization, such as it was, never included a reassembly estimate.

What happens to Aaron's invoice

The customer arrives the next day with a tow truck. The tow truck operator is from a transmission specialist shop in Beaverton. The customer has authorized the Beaverton shop to take the Subaru with the transmission in pieces. The customer pays Aaron the $200 originally authorized for evaluation. The customer pays nothing for the $850 teardown labor and pays nothing for any reassembly cost. The customer hands Aaron a copy of ORS §§646A.486 and 646A.482 printed off the Oregon legislature website.

Aaron consults his attorney. The attorney advises that, under the Oregon framework, Aaron's recovery for the disassembly labor depends on whether Aaron can prove the disassembly fell within the consumer's verbal "do whatever it needs" authorization at a level the statute would treat as adequate. The attorney's view: the verbal authorization is unlikely to satisfy ORS §646A.486 because it does not specify a dollar amount, and the absence of a separate reassembly estimate independently violates ORS §646A.482(2)(c). Aaron's likely recovery in small claims court: $200 (already paid). Likely recovery for the $850 teardown labor: zero. Likely recovery for any reassembly cost that Aaron's shop incurs to put the transmission back together for the customer's removal: zero (the customer is removing the vehicle, so Aaron does not incur reassembly cost — but Aaron also does not get to charge the customer for the work already done that has now been wasted).

Worse: under the Oregon Unlawful Trade Practices Act (ORS Ch. 646), violations of ORS §§646A.480-495 may constitute unlawful trade practices subjecting the shop to private actions with attorney fees. The Oregon Department of Justice Consumer Protection Section may also pursue enforcement. The customer in this case does not pursue independent litigation, but the path was open.

The five lines every Oregon auto repair invoice — and especially every transmission/engine teardown — should print

1. Initial written estimate before any work begins (including evaluation)

Required by ORS §646A.482. Itemized parts (with new/rebuilt/used designation), labor hours, hourly rate, total estimated cost (or reasonable range), customer signature with date or recorded electronic acceptance.

2. Separate disassembly cost AND separate reassembly cost — both itemized on the estimate before disassembly begins

Required by ORS §646A.482(2)(c). The estimate shows: cost of disassembly + cost of evaluation/diagnosis + cost to reassemble the vehicle if the customer chooses not to proceed with the major repair. The reassembly cost is the line item that protects the shop's labor recovery if the customer refuses the rebuild.

3. Specific dollar-amount authorization for any evaluation work above $200

Required by ORS §646A.486. The customer's authorization specifies the dollar amount. "Do whatever it needs" does not satisfy the statute. "Authorize evaluation up to $1,050 (transmission teardown $850 + diagnostic $200)" does.

4. Itemized invoice on completion with parts designations

Each part listed individually with new/rebuilt/used designation, unit price, labor itemized by job (hours and hourly rate), parts subtotal, labor subtotal, applicable Oregon — wait, Oregon has no statewide sales tax, so this is one of the few states where the tax line is blank. Total.

5. Customer-acknowledgment line on the final invoice

"I, [customer name], have inspected the work performed and acknowledge that the vehicle is in the condition described above. The work performed matches the work I authorized." Date. Signature. The signature defeats most subsequent ORS Ch. 646 unfair-practices claims at the consumer-evidence level.

Why Oregon's framework bites teardown shops uniquely

Most U.S. states permit a shop to perform diagnostic disassembly under broad customer authorization without specifying separate reassembly costs upfront. Oregon does not. The separate reassembly estimate is a structural protection for the consumer that converts a teardown decision into a two-stage authorization: (1) authorize the disassembly, (2) authorize the major repair OR the reassembly if the customer chooses to walk away.

Transmission and engine specialists in Portland, Eugene, Salem, and Bend — who do high volumes of teardown work — face this trap routinely. The shops that have updated their estimate templates to include the separate reassembly line item recover their labor when customers walk away. The shops that have not updated lose the labor cost on every walk-away job.

Mekavo's estimate template is configurable to support the Oregon two-stage authorization pattern: a "disassembly + evaluation" line item with a specific dollar amount, a separate "reassembly if customer declines major repair" line item with its own dollar amount, and a customer-signature line that authorizes both. When the customer walks away mid-teardown, the shop's recovery is documented in the original signed estimate.

Official resources

Last updated: April 2026. Statutes cited were current at the time of publication. The Oregon framework applies to all vehicle repair shops in the state. For a specific case — a customer who refused authorization mid-teardown, an ORS Ch. 646 unfair-practices demand letter — consult an Oregon attorney experienced in vehicle-repair-statute matters before proceeding.

Note on scenarios: The shops, names, addresses, and case reference numbers in this article are fictional and used solely to illustrate how the cited statutes operate in practice. Any resemblance to actual shops, owners, or events is coincidental. The statutes, regulations, and agency procedures cited are real and current as of publication.