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Sensor locations

Old 05-01-2015, 12:37 PM
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Join Date: Jun 2012
Posts: 2
Default Sensor locations

My dad needs some help locating the following sensor locations on his 2002 S80. He was given these codes and told they were possibly sensors that need to be replaced. Any help would be greatly appreciated. He really cant afford to take it to a shop since my moms in the hospital.

711A control module internal fault

280A Front Heated O2 Sensor B1

644A cam shaft position

641A exhaust cam shaft control

Last edited by Myka; 05-01-2015 at 12:42 PM.
Old 05-01-2015, 02:48 PM
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 4,675

The 711A is saying there is a signal problem into the ECM. This could have been set by a battery issue/alternator issue/wiring or the ECM itself. First step would be to see if you can clear the code and see if it represents.

The 280A is saying the O2 sensor went out of range. This could be that the O2 sensor needs to be replaced or something else is pushing the system - ie vacuum leaks can show up as O2 sensor issues

The 644A and 641A are related to the variable valve timing (VVT) - there's both a valve position sensor as well as a solenoid - either can mess up the valve timing (and throw the codes). The VVT solenoid and position sensor should be on top by the #1 cyl
Old 05-01-2015, 04:51 PM
Senior Member
Join Date: Oct 2010
Posts: 5,029

Guessing can be just as expensive as taking it to a shop. I would not replace the can position sensor for those VVT codes.
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