Two repair totals are comparable only when you know what each includes. One may include diagnosis and related components; another may price only the part named in a phone call. Choosing from the totals alone can turn an apparent saving into an incomplete comparison.
Use this worksheet to understand the proposals before authorizing work. It is not a local price survey and does not tell you which repair your vehicle needs.
Begin with the confirmed problem
Write the reported symptom and the diagnostic finding separately. “Vehicle will not start” describes a complaint. “This test supports this repair” is a more specific explanation of the recommendation. Ask what evidence supports replacing the proposed component and what remains uncertain.
If a quote is preliminary, label it that way. A rough phone range based on a symptom should not be compared as if it were the final price for a fully diagnosed repair.
Normalize the scope before the price
| Comparison item | Estimate A | Estimate B | Question to resolve |
|---|---|---|---|
| Diagnostic work | ___ | ___ | Included, separate or already completed? |
| Confirmed repair | ___ | ___ | Same fault and intended outcome? |
| Parts identity | ___ | ___ | Brand, condition and exact application? |
| Labor scope | ___ | ___ | Same removal, installation and testing? |
| Related items | ___ | ___ | Fluids, hardware, calibration or other work? |
| Fees and taxes | ___ | ___ | Included in the displayed total? |
| Warranty | ___ | ___ | Parts, labor, time/mileage and exclusions? |
| Change authorization | ___ | ___ | Who approves additional work and how? |
The FTC advises requesting a written estimate and understanding repair warranty coverage in writing. Its guidance also notes that diagnostic charges can apply. Use the written terms for your actual job rather than assuming industry-wide coverage. FTC Auto Repair Basics.
A comparison example without invented market prices
Imagine two illustrative proposals for the same complaint. Proposal A names a replacement part and installation. Proposal B includes further diagnostic time, the proposed repair and a stated post-repair check. Neither total can be judged fairly until you determine whether the additional diagnosis is necessary and whether both proposals address the same confirmed issue.
Likewise, “new,” “remanufactured” and “used” parts should not be silently treated as identical. Ask what is proposed and why it fits the vehicle and repair. The cheapest or most expensive option is not automatically the appropriate one.
Know what is not included
Ask about towing, mobile travel or service charges, difficult access, additional faults discovered during testing, and work requiring another facility. Confirm only the items relevant to your appointment. Do not infer that a mobile service can safely perform every procedure wherever the car happens to be parked.
If important scope remains uncertain, ask what the next authorized diagnostic step costs and what decision it will enable. A staged decision can be clearer than approving an undefined collection of possible repairs.
Close the loop after the work
Keep the final invoice, parts description, diagnostic findings, warranty terms and post-repair observations. Compare the final work with the authorization record. If the original symptom remains or a warning returns, contact the repair provider rather than assuming an additional part is automatically required.
For a Mike's Mobile Auto Repairs service request, provide the vehicle identity, symptom and any existing diagnosis. The goal is an understandable repair decision: what is known, what is proposed, what it includes and what still needs testing.