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P0089

To resolve diagnostic trouble code P0089 (https://www.yourmechanic.com/article/p0089-obd-ii-trouble-code-fuel-pressure-regulator-1-performance-by-spencer-clayton), the mechanic would test the fuel pressure regulator, check for a clogged fuel filter or screen, check for restricted fuel lines, and test fuel pump output. Typically, the problem will be found in...

Those faults are two totally separate issues. The P0441 is an evaporative emissions system fault, and the P0089 is a fuel pressure regulation fault. This generation of Audi A4 was notorious for high pressure fuel pump problems. There were multiple...