Volvo S70 owners have reported 2 problems related to speed sensor (under the vehicle speed control category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Volvo S70 based on all problems reported for the S70.
The contact owns a 2000 Volvo S70. While driving 40 mph the contact noticed that the rpm's suddenly increased from 2000 to 3000 within 15 seconds without the contact engaging the accelerator pedal. The vehicle was taken to the dealer where the contact was informed that the air mass meter, evaporator valve, catalytic converter, and the speed sensor needed to be replaced. There were no prior warnings. The vehicle was not repaired. The failure mileage was 117,000. The current mileage was 118,000.
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Here's what happened to we (my wife, three year old son and I) were driving our 2000 Volvo S70 sedan down interstate 95 from washington DC to north carolina. In virginia, the electronic throttle system (ets) sensor came on. We stopped, like the manual suggested, restarted the car and the light went out. Midway through virginia, the ets light and check engine light came on simultaneously. We stopped and again stopped the engine. Upon restart, the ets light went off, but not the check engine light. This took place the whole trip down I-95. We made it home, but don't feel comfortable driving our three year old around. The vehicle started to lose speed when the sensor came on. We stopped almost immediately every time, which is no great thrill when you are driving on an interstate. When the cruise control was set, the light came on, kicked off the cruise control and began to shake and shimmer. We stopped about ten times during a 150 miles trip.