p0174
Moderate
Mazda · SUVs & Crossovers
System Too Rich (Bank 2)
Quick Answer
Error code P0174 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 oxygen sensor
  2. Leaking fuel injector
  3. High fuel pump pressure
  4. Failed mass airflow sensor
  5. Air leak in intake system
How to Fix It
1
Test oxygen sensor output voltage
2
Measure fuel pressure at fuel rail
3
Inspect fuel injectors for spray pattern
4
Clean mass airflow sensor
5
Check for vacuum leaks
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
Oxygen sensor
Fuel injector
Fuel filter
Related Error Codes
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