You know it makes sensor

Lambda sensors from Bosch

Published:  08 June, 2010

With an eye on engine management, Bosch is reminding garages about the good margins to be made on lambda sensor replacement.

Bosch recommends that lambda sensors are checked every 20,000 miles and replaced at the recommended intervals. "This can benefit your customers by reducing fuel consumption by up to 15% per year," says Paul. When trouble-shooting three and four-wire lambda sensors remember that a faulty sensor often causes the OBD (MIL) light to come on. Paul advises that after checking the wiring and connections it's time for a test of the intake system. "An air leak in the engine's intake or exhaust system will bias the lambda sensor signal," he continued. "And don't forget to check the relevant wiring for possible open circuit, short to positive or short to ground."

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