DTC P0171 & P0174: Fuel Trim System (RH) Too Lean: Notes

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P0171 & P0174: Detection Condition & Possible Causes Chart

Courtesy of MAZDA MOTORS CORP.