97 Code P0174
 

I have a 97 Blazer and for about the last year I have been getting error code p0174 intermittently. Since I am just getting p0174 it CAN'T be a general intake or fuel system fault since it should then cause bothe the p0171 and p0174 faults. I started getting this fault shortly after replacing all of the O2 sensors in order to clear the error for a bad catalytic converter. I assume that one of the replacement o2 sensors is faulty but which one?

Drivers side of the engine

Thanks
So that means bank 1 is right side and bank 2 is left side?
Confuses my simple little mind.
For some reason I was expecting the opposite.
Again - thanks for the help

rsdslp, you are correct. P0174 indicates bank 2 is lean. Bank 1 is always the bank with #1 cylinder. On a left hand drive vehicle, (USA) bank 1 is the driver side and P0174 is indicating a problem with the passenger side.

Oops, I seen the p0171, sorry. Captain is right.

Trouble Code: P0174 (4.3L V6 VIN W Auto)
Fuel Trim System Lean Bank 2


Trouble Code Conditions:
Conditions for Setting the DTC. 1. No IAC DTCs 2. No HO2S DTCs 3. No TP sensor DTCs 4. No MAP DTCs 5. No EGR DTCs 6. No EVAP DTCs 7. No ECT sensor DTCs 8. No MAF sensor DTCs 9. No IAT sensor DTCs 10. No VSS DTCs 11. No Misfire DTCs 12. The throttle position is less than 69.9% 13. The engine speed is greater than 575 RPM but less than 4500 RPM 14. The BARO is greater than 70 kPa 15. The ECT is greater than 0°C but less than 99.7°C 16. The MAP is greater than 20 kPa but less than 98.9 kPa 17. The IAT is greater than -20°C but less than 69.7°C 18. The air flow is greater than 3 g/s less than 150 g/s 19. The vehicle speed is less than 85 mph 20. The average short term fuel trim is no more than 115

Possible Causes:

• If using the diagnostic tables does not isolate the problem, try monitoring the L. T. fuel trim and fuel trim cell while operating the vehicle under various loads. This may isolate the condition which caused the setting of this DTC. A condition that causes the DTC P0300 Engine Misfire Detected may also set this DTC; conversely an extremely lean condition which sets the current DTC can cause a misfire at idle and the DTC P0300 to set. If the cause of this DTC cannot be determined and the DTC P0300 is also set, refer to DTC P0300 Engine Misfire Detected .

you probably just got a bad o2 sensor. check for an exhaust leak on that side just in case