Oxford manager Chris Wilder was left bemused by his side's poor home form after watching them play out a 0-0 draw with York.
They managed just one real shot on target on the bobbly Kassam Stadium pitch, and Josh Parker's drive was brilliantly turned for a corner by keeper Michael Ingham.
Wilder said: "It's like chalk and cheese between how we were at Plymouth last week and today.
"We need a spark from somewhere but it's a real struggle for us at home at the moment.
"The players are a lot better than what they are producing when we play at home. We've got a lot more quality than what we're showing and that's so frustrating.
"We're struggling at the top of the pitch and struggling to create.
"And I think everyone can see that we don't have any confidence when we're playing at home. We just have to get our head down and keep working."