VEHICLES FROM THE TST BAYS

摘要

Our first vehicle is a 1999 Toyota Rav 4 2.0L with an automatic transmission that came in with the customer concerns of running rough, stalling and an illuminated Malfunction Indicator Lamp (MIL). When we connected our scan tool to the vehicle, we found two Diagnostic Trouble Codes (DTCs); a P0171 (System Lean - Bank 1) with Freeze Frame data and a P1130 (Air Fuel Ratio sensor circuit performance malfunction). Our visual inspection under the hood revealed that the AF sensor had already been replaced. With the scan data readings we saw for the P0171 and the AF sensor voltage, one could question if the AF sensor was defective or the wrong one for this Rav 4. We always want to test before we ever condemn any component and in this case, I wanted to see if the AF sensor could distinguish between rich and lean.