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Discussion Starter · #1 ·
I looked through many forums but couldn't find my specific problem. I never got too good MPG since shortly after I purchased the car (99 Passat 1.8T AEB), however after just changing the oil, valve cover gasket, spark plugs, control arms and springs, the MPG is still just as bad / worse. What can it be? I just want to get some decent mileage, it being my daily. Help please.
 

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Start with scanning for codes and post any you find here. You can start with a generic scan by an auto parts store, or you can buy a USB->OBD cable and use VCDS-Lite (which is more complete.)
 

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What mileage are you getting now and what driving conditions?
 

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Vag Com lite. You can also get an elm 327 bluetooth obd adapter and use the torque app to get a temp reading.
 

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Let's assume you use NGK plugs. I would say, what is the condition of your air filter? Make sure the air filter is always clean.

Use a couple of Techron fuel injector cleaners in an near empty tank so hopefully the injectors get a bit cleaner.

If the O2 sensor is too old you may consider replacing it.

Clean the MAF sensor and Throttle body (don't forget TB alignment after cleaning).

Consider replacing fuel filter too if that is too old.
 

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Discussion Starter · #8 ·
Let's assume you use NGK plugs. I would say, what is the condition of your air filter? Make sure the air filter is always clean.

Use a couple of Techron fuel injector cleaners in an near empty tank so hopefully the injectors get a bit cleaner.

If the O2 sensor is too old you may consider replacing it.

Clean the MAF sensor and Throttle body (don't forget TB alignment after cleaning).

Consider replacing fuel filter too if that is too old.

I have also recently replaced the air filter. I'm going to try to fuel injector cleaners either today or tomorrow (not always so affective) I haven't looked into the 02 sensor or cleaning the throttle body since I got the car. What exactly is TB aligning?
 
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