p2177
Moderate
Mazda · SUVs & Crossovers
System Too Rich (Bank 2)
Quick Answer
Error code P2177 on your Mazda SUVs & Crossovers means: System Too Rich (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
DKDJKEAPCRTCCVCV-PHEV
Likely Causes
  1. Faulty fuel injector spraying excess fuel
  2. High fuel pressure from regulator
  3. Faulty oxygen sensor
  4. Air leak preventing oxygen detection
  5. Failed mass airflow sensor
How to Fix It
1
Check fuel pressure (should be 50-60 psi)
2
Test oxygen sensor response with scanner
3
Inspect fuel injectors for leakage
4
Perform fuel injector cleaning
5
Replace faulty components as needed
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Fuel injector
Oxygen sensor
Fuel filter
Related Error Codes
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