Top notch diagnostic. Brought my 740 in and they found the bad sensor in minutes. Part was on hand and replaced. Not to knock my car, but this the second time the same O2 sensor went out within 2 years and I had the dealer replace the first one. I do remember paying a few $hundred more at the dealer. I am spoiled with the dealership waiting room though having WiFi, but then again I was in and out in half an hour and did save a ton of cash.
Pros: Cost, Troubleshooting
Cons: Need Free Wi-Fi in waiting room
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