04 XC90 with t6. Thing would cut off occasionally when slowing down. Had a cracked vacuum hose. Replaced it and car idles much smoother, but then would abruptly cut off when taking foot off gas (like coasting or hitting brakes). Did it many times in short distance after replacing hose - sometimes coasting down hill at 40 miles per hour!

Was getting code for too lean bank one, bank two. Light went off after fixing vacuum hose by the way

So I unplugged the battery to reset and drove with no problem. Now it cut off again once since then just once while braking.

Any experience on this sort of thing? Fuel pump relay, Fuel pressure sensor, camshaft position sensor?

Someone said this one doesn't have a fuel pressure sensor, but Auto Zone and Rock Auto sure sell one.

Any advice greatly appreciated