TROUBLE CODES 12 AND 28

1992 Toyota Camry

Tiny

CZevely

June, 8, 2010 AT 12:00 PM

Engine Mechanical problem
1992 Toyota Camry 6 cyl Front Wheel Drive Automatic 226700 miles

I have a 1992 V6 XLE Toyota Camry. I have found that trouble codes 12 and 28 flashed when I diagnosed my check engine light. I know from looking on line that trouble code 12 is the knock sensor signal and code 28 is the No. 2 Oxygen sensor signal. What I need to know is what specifically might need to be repaired based on this information?

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1 Answer

Tiny

KHLow2008

June, 9, 2010 AT 8:25 AM

Hi CZevely,

Thank you for the donation.

Code 12 is for RPM signal and not the knock sensor which should be either Code 52 or 55.

It could be due to a faulty distributor or its circuits, starter circuits or a bad ECU. There are no diagnostic procedures for this code.

As to Code 28, it is a fault with the main O2 sensor and it could either be th right or left bank as pre-OBD II trouble codes are not specific.

I have emailed the diagnostic files to you. They explain how to go about cheking/repairing the problem.

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