摘要: |
Our first Asian vehicle issue has the number one DTC in the country, P0420 (Figure 1) Catalyst Efficiency Below Threshold, Bank 1. This problem vehicle had 199,815 miles on the odometer, and that was presented to us with only a pending DTC (since the shop had previously erased the code). The shop this vehicle came from thought the rear 02 sensor was faulty and replaced both with new ones, only to end up with the same results. When the shop owner called me, he asked if we could diagnose the problem Land Cruiser. With the vehicle in our possession, we proceeded to perform a visual inspection, followed by connecting the eSCAN (our number-one scan tool for driveability and illuminated MIL issues). The results of the eSCAN yielded the following: 1.Pending P0420 2.Three Monitors "Not Ready" (Figure 2) 3.Mode 6 Bank 1 Catalyst failure (Figure 3) 4.Graphed data of the 02 sensors that revealed the front and rear sensor voltages were dithering (Figure 4) on both banks. |