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I have a bmw 528e 1988. The O2 sensor light has come on inside the car. What is this and can I fix it myself easily? Also I would like to replace the air filter myself but could not locate where the air filter is.
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you will need to have the o2s
you will need to have the o2s checked with a scan tool to see which sensor is faulty most are fairly east to change some not so easy as for the air filter you may try fram.com for filter location