P0430 on Honda Odyssey
Catalyst System Efficiency Below Threshold Bank 2
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Honda Odyssey context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0430.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0430 Means on Your Honda Odyssey
P0430 is a diagnostic trouble code indicating: Catalyst System Efficiency Below Threshold Bank 2. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Honda Odyssey Owner Reports
Source: NHTSA Complaints Database
"Life-Threatening Acceleration Lag: The vehicle is experiencing severe power loss during critical driving moments, for example, while entering intersections or attempting to re-accelerate into moving traffic."
"The contact owns a 2019 Honda Odyssey. The contact stated that the emission warning light was illuminated. The vehicle was taken to an independent mechanic, where a diagnostic scanner was used to retrieve diagnostic trouble codes P0420 and P0430."
"Honda of America has released a warranty extension for "MIL comes on with DTC P0420/P0430, P030X, and/or P219A/B". My vehicle fits under the mentioned engine codes however, is deemed ineligible for the extended warranty."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Honda Odyssey
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
-
1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
-
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
-
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.