Question

1996 Cadillac Seville 4.6L with engine codes P0101, P0171, and P0174 could this also be caused by a leak or bad fuel pump?

Answer 1

P0101 MAF airflow circuit range performance

P0171 Fuel trim lean Bank 1

P0174 Fuel trim lean Bank 2

Yes a MAF air duct leak can cause a lean Bank for Bank 1 and 2.Here is a MAF airflow duct that cause a lean code condition and a hard starting and idle condition. Low fuel pressure can also cause P0101 to not perform correctly and give lean bank codes.