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I have a 2001 lexus es300 with the check engine light on codes p1135 and p1155 I change both sensors with denso parts and the check engine is still on can anyone please tell me what else I need to do 

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Hi Mario....welcome to the Forum

It may be that you will need to manually remove the fault codes but otherwise it could be electrical connectors or wiring that are at fault...worth checking further.

Here are some links that may shine some light on the fault..

http://www.engine-codes.com/p1135_toyota.html

http://www.engine-codes.com/p1155_toyota.html

Let us know how you progress with it.

Cheers  Trevor

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Thanks for the information I figure out that the wiring was cut so fix the wiring and the check engine went away once again thanks for the info 

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