depending on what engine maker it is , likely an intake manifold or vacuum leak, ck that first
2000 ford lightning. P1540,po171.po174
Trouble code P0174 means:System too lean (bank 2)
1199 jag xj8 mas airflow sensor
PO171 = system adaptive fuel too lean (bank 1) PO174 = system adaptive fuel too lean (bank 2)
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Here is a video on how to fix engine code p0449
P0174 - system to lean, bank 2. You may simply have a vacuum leak affecting bank 2. Check under the hood for disconnected vacuum line(s) on engine.
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