20 Most Recent 2001 Volvo V40 - Page 5 Questions & Answers

https://www.volvov40club.com/forums/7-volvo-v40-general-discussion/25729-brake-light-fault.html

Has it ever been tuned up ie. Plugs, wires or boots, filters, and injection cleaning? Check the tire pressure, under inflated tires are the #1 cause of poor mileage. Also consider fuel quality and additives that don't contribute to combustion. I hope this helps, Take care.

LUCAS is one of the best sold at any parts store. And is made for just that. Read MNFCT recommendations and directions for uses on EGR, PCV and intake manifold build up.

you may want to look at your Catalytic / O2 sensor(s) Watch this video to learn more about how the O2 sensor works and what is required of the O2 sensor for it to work in the vehicle. https://www.youtube.com/watch?v=DvKZ2GDYEz4 Note: The vehicle in this vehicle does not compare to your own since the sensors on your vehicle may not be under your hood but may be on your header exhaust or you could have one on the lower exhaust pipe and one on the upper exhaust / manifold.

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem. Best Manuals

Have you tried to remove the B pillar to check for a loose clip or any coins

Have you removed the B pillar to see if you have any loose clips or coins ?

CANBUS communication error. There is no reset button. That error will require a mechanic as its electrical in nature.

No there is no reset, if a problem exist in the engine control system then the light will stay on until it is fixed.

more often than not its usually .025

I think the engine is sitting on the motor mounts, why do u ask?