Check Engine Light
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Check Engine Light Receipt Example
This receipt documents an OBD-II code read on a 2015 Subaru Outback at 83,500 miles with the check engine light on. The technician plugged in a scan tool, retrieved DTC P0420 (catalyst efficiency below threshold, Bank 1), and provided a written recommendation for further testing before authorizing a catalytic converter replacement. This is a low-cost, labor-only diagnostic receipt, the most common type issued by independent shops for a warning light complaint.
This check engine light diagnostic receipt documents a 1-hour OBD-II scan for a 2018 Ford Escape pulling DTC P0420 (catalyst efficiency below threshold). The diagnostic fee of $120 was applied toward the subsequent catalytic converter replacement quote.
Receipt Breakdown
What Makes This Receipt Realistic
- • 0.5 hr code read, correct billing for a quick scan without full inspection
- • Diagnostic fee as a separate flat charge, reflecting shop overhead for scan tool use
- • DTC code (P0420) and plain-language fault description in technician notes
- • Technician recommendation documented in writing, important for customer records
- • No parts lines: pure diagnostic visit before repair authorization
- • No warranty footer: code reads do not carry a parts/labor guarantee
Frequently Asked Questions
What is on a check engine light receipt?
This receipt shows two lines: OBD-II CODE READ 0.5 HR at $47.50 and DIAGNOSTIC FEE at $35.00. The subtotal is $82.50 and at 8% tax the total is $89.10, paid by debit card. The technician notes section records the DTC code retrieved (P0420: catalyst system efficiency below threshold, Bank 1) and the technician recommendation (catalytic converter replacement or oxygen sensor testing to confirm root cause).
What is the difference between a code read and a full diagnostic?
A code read (0.5 hr) retrieves stored fault codes and clears the check engine light. It does not include live data analysis, component testing, or a detailed inspection. A full diagnostic (1.0 hr) includes code retrieval plus a deeper investigation: test driving, sensor readings, visual inspection, and a root-cause determination. A code read is appropriate when the fault code is self-explanatory; a full diagnostic is recommended when the cause is ambiguous or the code keeps returning.
What is DTC P0420?
P0420 is the OBD-II fault code for 'Catalyst System Efficiency Below Threshold (Bank 1).' It means the downstream oxygen sensor is detecting less conversion activity than expected from the catalytic converter. The most common cause is a worn catalytic converter, but a faulty oxygen sensor, exhaust leak, or rich running condition can also trigger P0420. The receipt documents the code and the technician recommendation so the customer has a written record before authorizing a repair.