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Great luck with switching ECUs and o2 sensor on 1991. 200

posted by  RandallB on  Wed Oct 2 08:40 CST 2013
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last visit: Fri Nov 15 11:33 CST 2013
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Purchased 1991 240 about 5 weeks ago (running rich). This site is a great resource in learning about it.

o2 sensor voltage was reading .9 constantly. From reading, I got interested in updating ...561 (pink label) ECU to a ..951.

Spark plugs were bad black fuz before and exhaust was bad stink. It was throwing 113 code and throttle position sensor code.

New (used) ECU ($89), new bosch O2 sensor, and plugs.....running good and plugs are perfect clean. 02 sensor voltage fluctuates constantly. Haven't tested MPG yet, but it has to be much improved and in range of what it should be.


I am sure I will need more help from this forum in the future!

thanks all.





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New 1 Great luck with switching ECUs and o2 sensor on 1991. [200]
posted by  RandallB  on Wed Oct 2 08:40 CST 2013 >


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