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Check engine  po171 detected
Vehicle: 1999 Toyota Tacoma prerunner 3.4

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P0171 Fuel trim lean

Vacuum leaks are the common cause for a lean code condition, and with Toyota the sparkplug gaps should also be checked as well

​ The MAF airflow duct should be inspected , any tear here would allow false air to get pass the MAF sensor and set a lean code condition

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