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DTC - Engine values

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
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DTC - Engine values

Post by kymg » Mon Sep 02, 2019 12:07 am


My 2002 V70 NA threw the P0171 code the other day.

As part of the trouble shooting I am looking at the numbers for the various sensors on my OBD reader. It tells the RPM which is an obvious one and temp too but the others don't mean a lot to me but I suspect that they will help me diagnose the problem.

Can anyone point me in the right direction with a list of numbers or ranges of numbers that will let me know if things are within a correct range or really skew wiff.

The numbers relate to O2 sensors, short term fuel and long term fuel etc. I am just not sure what to search for on the site.

Any help gratefully received.


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Re: DTC - Engine values

Post by abscate » Mon Sep 02, 2019 3:26 am

That code is usually caused by a vacuum leak, which is caused by a crumbling hose somewhere.

Find the sticker under the bonnet which shows the vacuum routings and start pulling each one off, inspecting, and replacing . After 18 years, they are well past end of designed end-of-life

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