P0430: Catalyst System Efficiency Below Threshold (Bank 2)
Can you still drive? Yes, but get it checked soon. Continued driving with a failing catalytic converter can lead to further emissions system damage.
What Does P0430 Mean?
Code P0430 is the bank 2 equivalent of P0420. It indicates that the catalytic converter on the second bank of a V-engine is not operating efficiently. The downstream oxygen sensor detects that exhaust gases are not being properly converted, meaning the catalytic converter is deteriorating or another issue is affecting its performance.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Worn catalytic converter on bank 2
- Faulty downstream oxygen sensor
- Exhaust leak before the converter
- Persistent engine misfires on bank 2 cylinders
Symptoms
- Check engine light on
- Reduced fuel efficiency
- Sulfur or rotten egg smell from exhaust
- May fail emissions testing
Diagnostic Steps
- 1Read and record freeze frame data
- 2Compare bank 2 upstream and downstream O2 sensor waveforms
- 3Check for exhaust leaks on bank 2
- 4Inspect catalytic converter for physical damage or rattling
- 5Test downstream oxygen sensor response time
- 6Check for misfire codes on bank 2 cylinders
Recommended Parts & Tools
catalytic converter
downstream oxygen sensor
exhaust gasket
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $250 - $2500 |
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Chat with AI About P0430Commonly Affected Vehicles
Related Recalls
1 Active Recall — 2026 Ford F-150
The following NHTSA safety recalls have been issued for this vehicle. Contact your dealer to check if your vehicle is affected.
ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL
Ford Motor Company (Ford) is recalling certain 2021-2026 F-150, 2022-2026 F-250 SD, F-350 SD, F-450 SD, F-550 SD, Maverick, 2024-2026 Ranger, 2023-2026 F-600 SD, 2022-2027 Lincoln Navigator, Expedition, and 2026 E-Transit vehicles. When towing a trailer, the integrated trailer module (ITRM) may lose communication with the vehicle, possibly causing a loss of brake and turn signal lights, or a loss of brake function. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, " Lamps, Reflective Devices, and Associated Equipment."
Remedy: The integrated trailer module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters are expected to be mailed March 17, 2026. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 26C10. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning March 17, 2026.
Data provided by the National Highway Traffic Safety Administration (NHTSA).
Frequently Asked Questions
What is bank 2?
Bank 2 refers to the side of the engine that does not contain cylinder 1. On V6 and V8 engines, each bank has its own catalytic converter.
Can I drive with P0430?
Yes, the vehicle is safe to drive. However, it will fail emissions testing and continued driving may worsen the catalytic converter damage.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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