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17 Jun, 2020
Depends on the car you use
2 of 2 found this helpful Works amazingly well with an old car and single exhaust pipe. We tried it with a 2002 Honda Accord ULEV, and nothing happened to voles or the Honda. Then we hooked up a 1996 Volvo 850 once in 2006 and the voles never came back for 10 years after. However, the back pressure broke the oxygen sensor in the exhaust system the Volvo 850. The oxygen sensor is a non-critical but expensive part to replace.