Open the bonnet, lean over the engine and find the exhaust coming out of the back of the engine. The exhaust drops down to go underneath the vehicle as its drops down there is a sensor with wires going to it in the exhaust. This is the front O2 sensor (Lambda sensor). Next in line you'll see the catalytic converter, then after this there is another O2 sensor (the back one) Once you've found it you may find accessing it easier from underneath the car. Hope that helps...
The 2010 Volvo C70 has 38.2 in. of front head room.
The 2010 Volvo C70 has 53.6 in. of front shoulder room.
The 2011 Volvo C70 has 38.2 in. of front head room.
The 2004 Volvo C70 has 55.5 in. of front shoulder room.
The 2008 Volvo C70 has 53.1 in. of front hip room.
The 2007 Volvo C70 has 53.1 in. of front hip room.
The 2009 Volvo C70 has 53.6 in. of front shoulder room.
The 2009 Volvo C70 has 53.1 in. of front hip room.
The 2010 Volvo C70 has 53.1 in. of front hip room.
The 2004 Volvo C70 has 51.7 in. of front hip room.
The 2004 Volvo C70 has 39.2 in. of front head room.
The 2011 Volvo C70 has 42.3 in. of front leg room.