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
Likely Causes
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
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