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P0430ModerateEmissions

P0430: Catalyst System Efficiency Below Threshold (Bank 2)

29 vehicles · 15 makes · $100-$6,000 repair

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Most Reported On

2007-2019Toyota Tundra1794 Edition +62004-2012Mazda RX-82006-2019Volkswagen Beetle2009-2019RAM 15002011-2018Porsche CayenneBase +2

P0430 is an OBD-II diagnostic trouble code meaning “Catalyst System Efficiency Below Threshold (Bank 2).” Same as P0420 but for the Bank 2 catalytic converter. When both P0420 and P0430 appear, the upstream cause is typically shared. This code is most commonly reported on 2007-2019 Toyota Tundra (1794 Edition, Base, Limited, Platinum, SR, SR5, TRD Pro), 2004-2012 Mazda RX-8, and 2006-2019 Volkswagen Beetle, plus 26 other vehicles, with repair costs ranging from $100 to $6,000.

On This Page

  • Common Causes
  • Repair Cost
  • Vehicles (29)
  • Related Codes
  • FAQ
  • Sources (12)

Makes

  • Chevrolet1
  • Chrysler1
  • Dodge2
  • Ford1
  • Honda2
  • Jeep2
  • Kia2
  • Mazda1
  • MINI1
  • Nissan7
  • Opel1
  • Porsche1
  • RAM2
  • Toyota5
  • Volkswagen1
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Common Causes

1Worn catalytic converter Bank 2
2Faulty downstream O2 sensor
3Exhaust leak
4Misfires damaging catalyst
5Rich running condition

Typical Repair Cost

$100 - $6,000

Based on 30 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.

Diagnostic Tools

To diagnose P0430, you'll need an OBD-II scanner. Here are our recommendations at every price point.

Budget Pick$10–$20

ANCEL AD310 Classic OBD-II Scanner

by ANCEL

A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).

  • Read & clear engine codes
  • View freeze frame data
  • I/M readiness status
  • No batteries or app needed
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Best Value$90–$120

BlueDriver Pro Bluetooth Scanner

by BlueDriver

Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.

  • Enhanced diagnostics (ABS, SRS, transmission)
  • Repair Reports with verified fixes
  • Smog check readiness
  • Free app (iOS & Android)
Check Price on Amazon
Advanced$180–$230

LAUNCH CRP123X OBD-II Scanner

by LAUNCH

A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.

  • Engine, transmission, ABS, SRS diagnostics
  • Live data stream & graphing
  • AutoVIN for vehicle identification
  • Free lifetime updates via Wi-Fi
Check Price on Amazon
Professional$350–$450

Autel MaxiCOM MK808S Diagnostic Tool

by Autel

Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.

  • All-system diagnostics (25+ modules)
  • Bi-directional control & active tests
  • Oil reset, EPB, BMS, TPMS, injector coding
  • 7-inch touchscreen with Android OS
Check Price on Amazon

As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.

Vehicles Affected (29)

Silverado 2500HDModerate

Exhaust Manifold Bolt Failure

1999-2025$300-$2,0000 reports
300Moderate

5.7L HEMI Exhaust Manifold Bolt Failure

2005-2023$400-$1,500350 reports
ChallengerModerate

HEMI Exhaust Manifold Bolt Failure

2008-2023$400-$1,500320 reports
StealthModerate

Active Exhaust System (AES) Valve Failure

1991-1996$200-$600150 reports
ExplorerModerate

PTU (Power Transfer Unit) Failure

2011-2019$400-$2,200789 reports
InsightModerate

Catalytic Converter Failure (First Gen)

2000-2006$400-$2,0000 reports
PassportModerate

Exhaust Manifold Stud Breakage and Exhaust Leak Tick on 3.2L V6

2000-2002$300-$1,4000 reports
ComancheModerate

4.0L Inline-6 Exhaust Manifold Cracking

1990-1992$200-$700180 reports
Grand CherokeeModerate

Exhaust Manifold Bolt Failure and Manifold Leak on 4.7L V8

1999-2009$400-$1,4000 reports
SoulCritical

Catalytic Converter Overheating and Engine Piston Damage

2012-2016$0-$6,000678 reports
SpectraModerate

Catalytic Converter Premature Failure

2000-2009$400-$1,2000 reports
RX-8Critical

Catalytic Converter Clogging

2004-2012$500-$1,5004,500 reports
GPModerate

Cracked Exhaust Manifold (Turbo Models)

2013-2023$800-$3,0000 reports
TitanModerate

Exhaust Manifold Bolt Failure and Leak

2004-2015$300-$1,500920 reports
NV200Moderate

Catalytic Converter Theft Vulnerability

2013-2021$1,000-$3,000500 reports
ArmadaModerate

Exhaust Manifold Cracking (Both Banks)

2004-2015$500-$1,5000 reports
MuranoModerate

Premature Catalytic Converter Failure

2003-2020$500-$2,5000 reports
PathfinderModerate

Exhaust Manifold Cracking

2001-2012$400-$9000 reports
MaximaModerate

Catalytic Converter Premature Failure (Bank 1)

2004-2018$400-$1,8000 reports
PathfinderModerate

Premature Catalytic Converter Failure

2013-2020$500-$2,5000 reports
InsigniaModerate

Insignia A Flex-Pipe Exhaust Failure

2008-2017$120-$6000 reports
CayenneModerate

Catalytic Converter Premature Failure

2011-2018$2,000-$6,0001,400 reports
1500Moderate

Exhaust Manifold Bolt Breakage

2009-2019$100-$7001,432 reports
1500 ClassicModerate

5.7L HEMI Exhaust Manifold Bolt Breakage

2019-2024$500-$1,5000 reports
TundraModerate

Exhaust Manifold Cracking and Bolt Failure

2007-2019$500-$3,0007,500 reports
4RunnerModerate

Cracked Exhaust Manifolds on 4.7L V8 Causing Ticking Noise and Exhaust Leaks

2003-2009$700-$2,2000 reports
MR2Critical

Pre-Catalytic Converter Disintegration (Spyder)

2000-2005$500-$2,0000 reports
SequoiaModerate

Exhaust Manifold Cracking (4.7L 2UZ-FE V8)

2001-2007$800-$3,0000 reports
CelicaCritical

Pre-Catalytic Converter Disintegration

2000-2005$500-$2,0000 reports
BeetleModerate

Ignition Coil Pack Failure (All Engines)

2006-2019$100-$4002,200 reports

Related Codes (8)

01447EVAP System (VAG)P0401Exhaust Gas Recirculation Flow InsufficientP0402Exhaust Gas Recirculation Flow ExcessiveP0403Exhaust Gas Recirculation Circuit MalfunctionP0404Exhaust Gas Recirculation Circuit Range/PerformanceP0410Secondary Air Injection System MalfunctionP0411Secondary Air Injection System Incorrect Flow DetectedP0412Secondary Air Injection System Switching Valve A Circuit

FAQ

What does P0430 mean?

P0430 stands for "Catalyst System Efficiency Below Threshold (Bank 2)." Same as P0420 but for the Bank 2 catalytic converter. When both P0420 and P0430 appear, the upstream cause is typically shared.

What are the most common causes of P0430?

The most common causes of P0430 are: Worn catalytic converter Bank 2, Faulty downstream O2 sensor, Exhaust leak, Misfires damaging catalyst, Rich running condition. The specific cause varies by vehicle.

How much does it cost to fix P0430?

Repair costs for P0430 range from $100 to $6,000, depending on the vehicle and root cause.

Which vehicles are affected by P0430?

Au7o has documented P0430 across 29 vehicle models from 15 manufacturers: Chevrolet, Chrysler, Dodge, Ford, Honda, Jeep, Kia, MINI, Mazda, Nissan, Opel, Porsche, RAM, Toyota, Volkswagen.

Sources (12)

  • Forum2015 Kia Soul Engine Issues Failed cat converter - Kia Soul Forums
  • ForumBlown Engine Due to Catalytic Convertor - Kia Soul Forums
  • ForumThe Dreaded Soul Catalytic Converter Issue - Kia Soul Forums
  • ForumFAILED CATALYTIC CONVERTER NOW ENGINE COMBUSTION FAILURE - Kia Soul Forums
  • newsNV200 Prime Target for Catalytic Converter Theft
  • Forum1ZZ Pre-Cat Engine Failures - MR2 SpyderChat
  • ForumCatalytic Converter Engine Failures Post Yours - MR2 SpyderChat
  • ForumPre-cat failure - not overseas myth - MR2 Owners Club NZ
  • ForumPre Cat Cat Failure - MR2 SpyderChat
  • NHTSANHTSA Vehicle Complaints - 2002 Honda Passport (engine / exhaust-related complaints)
  • ForumJeepForum threads on 4.7 exhaust manifold bolt breakage and ticking
  • RecallNissan Recall 20V123000 - Exhaust Manifold Cracking on Certain Nissan Vehicles

Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.

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