P0420 on TOYOTA CAMRY — Catalyst System Efficiency Below Threshold Bank 1

Q: "What does P0420 mean on a TOYOTA CAMRY?"

"P0420 indicates: Catalyst System Efficiency Below Threshold Bank 1. This is a emission controls code. 2 TOYOTA CAMRY owners have reported this to NHTSA."

Q: "What are the most common causes of P0420 on TOYOTA CAMRY?"

"Based on 2 NHTSA reports, the most commonly cited components are: Service Brakes,Fuel/Propulsion System,Forward Collision Avoidance, Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0420 serious on my TOYOTA CAMRY?"

"Of 2 NHTSA reports for this code on TOYOTA CAMRY, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my TOYOTA CAMRY shows P0420?"

"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 P0420 Means on Your TOYOTA CAMRY

P0420 is a diagnostic trouble code indicating: Catalyst System Efficiency Below Threshold Bank 1. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 TOYOTA CAMRY owners have reported this issue to NHTSA across model years 2007-2008. Most reports come from the 2007, 2008 model years. The most commonly reported component is Service Brakes,Fuel/Propulsion System,Forward Collision Avoidance (50.0% of reports).

Real TOYOTA CAMRY Owner Reports

Source: NHTSA Complaints Database

"All of a sudden, all of my warning lights came on including: brake light, check vcs system, abs, all of the exclamation lights, etc.. ive been very diligent about the maintenace on y vehicle and had the codes read and reset, but they keep coming back on."

— 2007 TOYOTA CAMRY owner · SERVICE BRAKES,FUEL/PROPULSION SYSTEM,FORWARD COLLISION AVOIDANCE · Filed 04/14/2025

"All toyotas with 2azfe engines and their variants need to be recalled. there is an inherent problem with excessive oil consumption due to a design flaw in both the pistons and rings of the engines."

— 2008 TOYOTA CAMRY owner · ENGINE · Filed 09/09/2014

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

📊 Complaint Trend by Model Year

1

'07

1

'08

Common Causes on TOYOTA CAMRY

Based on NHTSA complaint component analysis for this vehicle.

SERVICE BRAKES,FUEL/PROPULSION SYSTEM,FORWARD COLLISION AVOIDANCE 50%

ENGINE 50%

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 P0420 mean on a TOYOTA CAMRY? ▾

P0420 indicates: Catalyst System Efficiency Below Threshold Bank 1. This is a emission controls code. 2 TOYOTA CAMRY owners have reported this to NHTSA.

What are the most common causes of P0420 on TOYOTA CAMRY? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Service Brakes,Fuel/Propulsion System,Forward Collision Avoidance, Engine. These percentages are based on the component field in owner complaints.

Is P0420 serious on my TOYOTA CAMRY? ▾

Of 2 NHTSA reports for this code on TOYOTA CAMRY, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my TOYOTA CAMRY shows P0420? ▾

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.