P0174

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System Too Lean (Bank 2)

What this code means

The fuel mixture on bank 2 is too lean - twin of P0171 on V-engines. Both appearing together points to a shared cause.

Common symptoms

Rough idle, hesitation
Check engine light
Worse economy

Most common causes

Vacuum leak (often intake gaskets)
Dirty MAF sensor
Weak fuel delivery
PCV system leak

Can you keep driving?

Driveable, but prolonged lean running overheats combustion - diagnose soon.

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Descriptions are for guidance only. Accurate diagnosis requires a workshop inspection.