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What is the reason for the Peugeot P0170 fuel injection malfunction?

1 Answers

DeRiley

07/30/25 4:31am

P0170 trouble code, applicable to all automobile manufacturers, refers to fuel trim (air-fuel ratio). 1. Introduction to fuel trim: Fuel trim refers to the electronic control unit (ECU) controlling fuel delivery by increasing or decreasing the opening time of the fuel injector, thereby enabling the engine to achieve the optimal air-fuel ratio (the mass ratio of air to gasoline is 14.7:1). A too-rich air-fuel ratio means excessive fuel delivery, while a too-lean air-fuel ratio means insufficient fuel delivery. 2. Possible causes of the malfunction: include air leaks downstream of the mass air flow (MAF) sensor, PCV system leaks, exhaust leaks near or before the oxygen sensor, clogged fuel injectors or other fuel system faults, EGR system leaks, contaminated MAF sensor (causing the electronic control module to underestimate air flow), fuel tank level too low, or improperly seated oil dipstick, among others.

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