Question

How to fix the engine code P1334 on my 2004 Ford F350 6.0L Diesel?

Answer 1

P1334 Exhaust gas recirculation  (EGR) throttle control

For this code condition to occur the EGRTP (Exhaust gas recirculation throttle position) signal voltage is short to ground or the EGRTP is non op. Some fixes that corrected P1334 was a new throttle assembly

Answer 2

P1334 FORD Code - EGR Throttle Position Sensor Minimum Stop Performance
Read more: https://www.autocodes.com/p1334_ford.html