P0174
System Too Lean (Bank 2)
Description
System Too Lean (Bank 2). This powertrain diagnostic trouble code covers the engine, the fuel and ignition systems, emission control and the transmission.
OBD Codes Details
Possible Causes
Faulty sensor, intake leak, clogged fuel filter, weak fuel pump, damaged wiring
Solution
Check for intake leaks, inspect and clean the sensor, measure fuel pressure, compare live data against the expected range
Symptoms
- Engine runs lean causing rough idle on bank 2
- Hesitation or stumbling during acceleration
- Increased engine temperature
- Poor fuel economy
- Check engine light illuminated
Diagnostic Recommendations
- Check for vacuum leaks in the intake manifold and hoses on bank 2
- Test MAF sensor operation and cleanliness
- Inspect fuel pressure and fuel pump performance
- Check O2 sensor readings and response time on bank 2
- Test fuel injectors on bank 2 for proper flow
Repair Cost Estimate
- Vacuum leak repair: $100-300
- MAF sensor cleaning/replacement: $50-400
- Fuel pump replacement: $400-800
- O2 sensor replacement: $150-400
- Total diagnostic and repair: $200-1500
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Fact-checking completed
Verified by:
Pavel Volkov
Created:
Information verified against official sources
Official Sources
Society of Automotive Engineers
Official OBD-II diagnostic trouble codes standard (SAE J2012)
Automotive engineering standards organization
International Organization for Standardization
International standard for vehicle diagnostic systems
International standards for automotive diagnostics
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