how do you fix code 55(knock signal circuit RH bank)

1993 LEXUS ES 300

128,000 MILES

ROD J

MEMBER
2 POSTS

I change the knock sensors, throttle body,throttle position sensor, and the ecm. I had the negative battery cable disconnected and I pulled the efi fuse when I did all the work. The check engine light still comes on and goes off with the code 55 appearing.

Sep 27, 2011 at 1:03 PM

ASEMASTER6371

✓Experienced Mechanic
52,796 POSTS

wow, you replaced a lot of parts. in most cases I have seen, the connectors on the sensors are what fails. the end kit is about 30.
you really should have spent the money for a real diag from a shop. it would have prevented needless parts replacement.

Take a look at the chart I sent you for the code.

Roy

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