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I HAVE REPLACED everything listed for the CEL codes:

P0171 and P0440 always together.

1997 VW Golf, 4 cyl. OBD II

New MAS
New front heated Oxy sensor
All new vacuum hoses, including brake booster hose
New spark plugs
New Ignition wires
New cap and rotor
new fuel filter
New air filter
New PVC system
Cleaned fuel injection system, including injectors
New gas tank cap
All new intake gaskets and seals
New fuel pressure regulator
New exhaust
Cleaned and aligned throtte body

Reset CELs many times

Vehicle: 09-1996, Volkswagen, Golf, GTI, MK3, 2.0 4 cyl.

1 Answer

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P0171 Fuel trim too lean

P0440 Evaporative emission control system malfunction

A vacuum leak at the Evaporative purge hose  can cause this code condition ,

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