Hi everyone, I have a 2001 K11 with only 46,000 miles on it. I’ve had it put on diagnostics and watched live data and it showed the sensor after the CAT wasn’t working so I replaced with a new Bosch one. It takes about a week now for the engine light to come on so it obviously helped in some sort of way because it used to come on about three days after switching the light out. I was wondering would a petrol cleaner of some sort help cure it anyway. Thanks in advance ??
System too lean Bank 1
- Thread starter Dan_spooner
- Start date
That fault you've described is caused by the first o2 sensor. The second one only monitors the cat.
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So do I need to replace the first one? Also I have another problem and that is when you are in third or fourth at cruising speed it feels like it is missfiring, it occasionally does it on idle but not all the time.
I'd check for air leaks first before replacing the o2 sensor.
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The first one was working fine unless it’s intermittant
