FWD Newsletter September 2009
Page 8: O2 Sensor Testing Tech Tip, O2 Sensors, O2 Sensor Wrench, Turbo Drain Pipe Seal Kit, Turbo Drain Seal Tool

The sensor produces a small voltage based on the oxygen content in the exhaust relative to the outside air. When the mixture is lean the oxygen content is high and the voltage is low. When the mixture is rich, the voltage is higher.

The voltage can be measured with a voltmeter capable of measuring with a minimum of 10 mega ohms impedance. Do not use a meter with less, as it may damage the ECU.

Connect the positive test lead to the oxygen sensor and the negative lead to ground. Start the car and warm it up to operating temperature (the oxygen sensor does not work until the temperature reaches 600 degrees).

Note: Leave the oxygen sensor connected, and probe through the rear of the connector when connecting the volt meter.

At idle the oxygen sensor should be between .04 and 1.0 volts. The voltage should fluctuate. This indicates that the sensor is working. If it’s steady or there’s no voltage, the sensor is probably bad. Another, less accurate, test is to simply disconnect the sensor when the car is running; if the idle fluctuates after about 30 seconds, plug it in again and the engine should fluctuate again until it smoothes out the idle. If no change occurs, then the sensor is probably bad

Oxygen Sensors for Efficient, Trouble-free Performance

Most often the fault given from the on board diagnostic system is a fault with the oxygen sensor. It is important that the proper fuel mixture is maintained for optimum fuel efficiency. Be sure there are no other faults before replacing just the oxygen sensor. These are Bosch oxygen sensors for original equipment fit and function. Be sure to check the part number on your car first.

Use our oxygen sensor tool for removal (available below). Our tool features a slot machined in it that allows it to be slipped over the sensor wire for secure removal and installation even in tight spots like on turbo models.

Oxygen Sensor Wrench

Replacing the oxygen sensor on your Volvo can be a real pain. Since it is installed directly in the headpipe or exhaust manifold, it will usually be severely rusted or corroded in place. The main sensor lead comes right out of the center of the sensor, so it’s not possible to use a standard socket. Our “High Leverage” long handle oxygen sensor wrench allows it to be slipped over the sensor wire for secure removal and installation even in tight spots, especially when working on turbo models.

Lately we’ve noticed that many of the newer Turbo Volvos have a tendency to leave oil drips. In many cases, the oil drip is coming from the turbo drain pipe seal (located near the center back side of the engine). We put together this kit with instructions so that you can fix it yourself and in less than an hour you can have it repaired. You’ll need a 5mm Allen wrench  and 10mm socket.

Turbo drain seal leaks are an all too common problem. Make quick work of this job with our universal 5mm allen socket. This tool accesses the two allen bolts on the upper end of the drain pipe where space it limited. Oil leak repairs aren’t so bad with tools like this. This tool is absolutely required to remove the tubo drain pipe seals on AWD models. For other models use torx 30 - see page 60.