Sample preview
What a Shop Brief looks like.
Sample 2016 Toyota Camry ? P0420
Likely issue: catalyst efficiency fault, confirm exhaust and fuel trim before replacing converter.
Ranked Causes
- Exhaust leak ahead of downstream oxygen sensor
- Aging catalytic converter
- Slow oxygen sensor response
- Fuel trim issue causing converter stress
Fair Price Bands
- Diagnostic inspection: $90-$180
- Oxygen sensor: $180-$420
- Aftermarket converter: $650-$1,600
- OEM converter: $1,400-$3,200
Ask the Shop
Can you show upstream and downstream oxygen sensor graphs, fuel trims, and any exhaust leak test before quoting a converter?
Printable Handoff
Customer reports check-engine light with P0420. Please confirm exhaust integrity and fuel trim condition before parts replacement.