WEGO IV Wide-Band Exhaust Gas Oxygen Sensor System Installation Instructions

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1. Turn off the ignition switch before proceeding. 2. Select a convenient mounting location for the Bosch sensor. In general, the sensor should be mounted as close to the exhaust valve or exhaust manifold as practical. When choosing a mounting location, allow several inches clearance for the sensor wire harness. The wire harness must exit straight out from the sensor. Do not loop the harness back onto the sensor body. The sensor responds to oxygen pressure. Excessive backpressure will cause a reading error. For turbocharged applications, you must mount the sensor downstream of the turbo. 3. For temporary use during dyno tuning, you can mount the Bosch wide-band sensor in place of one of the original equipment rear oxygen sensors (after the catalytic converter). You can also use a sniffer in the tailpipe. For permanent mounting, an 18 x 1.5 mm weld nut must be welded onto the exhaust pipe. After welding, run an 18 x 1.5 mm tap through the threads. Failure to clean the threads may result in sensor damage. Note that most automotive muffler shops are familiar with oxygen sensor weld nut installation on custom pipes. Do not install the sensor until after the free air calibration procedure described in the following section. Always use an anti-seize lubricant such as Permatex 133A on the sensor threads. 4. Install the WEGO IV unit where the display will be visible during testing. The unit is not sealed and must be mounted in a dry location away from sources of heat. We recommend underdash mounting or use in a dyno lab environment. The unit is not intended for underhood mounting. The unit can be secured by means of Velcro tape strips. Use nylon tie wraps to secure the wire harness near the unit. 5. Working with clamping terminal blocks . All connections to the WEGO IV terminal block must be clearly identified either by means of distinct wire colors (such as shown in Figure 1) or wire labels. If you use different wire colors, mark up Figure 1 for future reference. All connections can be made with 18-20 AWG wire. Wire should be stripped back