ScanFixAI
FeaturesPricingDTC CodesCompareDownload
Home › DTC Codes › P0422

P0422 — Main Catalyst Efficiency Below Threshold (Bank 1)

Bank 1 main catalyst not meeting efficiency requirements.

Severity: MediumRepair: $100-$2,500Difficulty: Medium

Don't guess — diagnose P0422 the right way

ScanFixAI reads every module, finds the real root cause, and tells you exactly what to check.

Download ScanFixAI Free

Common symptoms of P0422

Common causes of P0422

Repair cost & difficulty

Typical cost to fix P0422: $100-$2,500 · Difficulty: Medium

Pro tip: Same diagnosis as P0420.

Vehicles commonly affected

All makes

Related trouble codes

P0420P0421

© 2026 ScanFixAI · AI-powered car diagnostics. All trouble codes · Home · Compare

ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.