Power loss when driving- won’t go above 20mph

[kristen_1819]

08 mk5 GTI- I got the O2 sensor code coming up, fuel measuring system malfunction (bank 1) O2 sensor positive current control etc. here are the codes

04243 08598 08759 08825
It's a stage 1 APR tuned and is at 111k miles

Please help! Thank you so much!

 

[ROH ECHT]

These two codes will not pinpoint the issue. There could be multiple causes for them. Data is likely the only way to isolate the cause and diagnose the problem.
But maybe the info in these two links will help you some...these two codes could be the cause of the O2 faults as well;
http://wiki.ross-tech.com/wiki/index.php/17501/P1093/004243

http://wiki.ross-tech.com/wiki/index.php/18711/P2279/008825

Two things; check the N276 (solenoid valve on top of the HPFP) for cracks, but it may have just failed. And even do a thorough testing (smoke or pressure) for inlet air leaks. But a sensor may have failed and more...so again, turning to data viewing may be required.