P0430 on HONDA ODYSSEY — Catalyst System Efficiency Below Threshold Bank 2

Q: "What does P0430 mean on a HONDA ODYSSEY?"

"P0430 indicates: Catalyst System Efficiency Below Threshold Bank 2. This is a emission controls code. 3 HONDA ODYSSEY owners have reported this to NHTSA."

Q: "What are the most common causes of P0430 on HONDA ODYSSEY?"

"Based on 3 NHTSA reports, the most commonly cited components are: Engine,Fuel/Propulsion System, Fuel System, Gasoline, Fuel/Propulsion System. These percentages are based on the component field in owner complaints."

Q: "Is P0430 serious on my HONDA ODYSSEY?"

"Of 3 NHTSA reports for this code on HONDA ODYSSEY, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my HONDA ODYSSEY shows P0430?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

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.

3 HONDA ODYSSEY owners have reported this issue to NHTSA across model years 2019. Most reports come from the 2019 model year.

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."

— 2019 HONDA ODYSSEY owner · ENGINE,FUEL/PROPULSION SYSTEM · Filed 01/19/2026

"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."

— 2019 HONDA ODYSSEY owner · FUEL SYSTEM, GASOLINE · Filed 04/28/2023

"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."

— 2019 HONDA ODYSSEY owner · FUEL/PROPULSION SYSTEM · Filed 03/06/2025

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

3

'19

Common Causes on HONDA ODYSSEY

Based on NHTSA complaint component analysis for this vehicle.

ENGINE,FUEL/PROPULSION SYSTEM 33.3%

FUEL SYSTEM, GASOLINE 33.3%

FUEL/PROPULSION SYSTEM 33.3%

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.

Frequently Asked Questions

What does P0430 mean on a HONDA ODYSSEY? ▾

P0430 indicates: Catalyst System Efficiency Below Threshold Bank 2. This is a emission controls code. 3 HONDA ODYSSEY owners have reported this to NHTSA.

What are the most common causes of P0430 on HONDA ODYSSEY? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Engine,Fuel/Propulsion System, Fuel System, Gasoline, Fuel/Propulsion System. These percentages are based on the component field in owner complaints.

Is P0430 serious on my HONDA ODYSSEY? ▾

Of 3 NHTSA reports for this code on HONDA ODYSSEY, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my HONDA ODYSSEY shows P0430? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.