2000 outback losing power going uphill also gets louder , starts fine runs and revs smooth in park. Check engine light is on code 420 (cat) last time uphill check engine light was flashing

Asked by Mar 12, 2019 at 09:29 PM about the 2000 Subaru Outback

Question type: Maintenance & Repair

7 Answers

1,370

Fuel pump

1,370

Anytime u have a lack of power uphill and a flashing check engine light its fuel related.. 99% of the time its lack of fuel(failing pump)

268,735

Lack of power up a hill could be an ignition miss or a plugged up catalytic converter.

1,370

Clogged converters, dirty mass airflow sensor, and severe ignition coil problems are causes but its more likely to be fuel pressure problems when dealing with uphill problems

268,735

There is a code indicating the cat.

1,370

P0420 Cat inefficiency.. computer doesnt like the oxygen storage of the cat... has nothing to do with it being blocked

1,370

Get a chrap scantool that has live data graphing and look at the oxygen sensor voltage, go for a test drive. During a heavy acceleration or uphill drive monitor the voltage and see what it is.. if it drops lean near 0 volts its a fuel issue

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