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
Likely Causes
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
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