diagnostics codes PO 0303 and PO 0171 advanced troubling shooting

What is your question?

Forester suddenly began running rough and stalling and the Check Engine light was flashing. I used an OBD diag checker which resulted in the above diag codes. I know what they are but don't know what to do next regarding which components to troubleshoot. What do you think?

What makes this problem better or worse?

accelerating

How long has your 2002 Subaru Forester had this problem?

a few hours

Visitor

Mar 31, 2019

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RepairPal Certified shops can diagnose and repair your 2002 Subaru Forester. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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Tuffy Tire & Auto Service Center - Grandview

4.7

(85)

2.39 mi

1524 W 5th Ave

Columbus, OH

Closed

Opens 8:00 AM Mon

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Excite Auto Repair & Towing

4.4

(15)

5.94 mi

3430 Westerville Road

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Closed

Opens 9:00 AM Mon

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All In Auto Service

4.7

(30)

6.56 mi

5200 Fisher Road

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Closed

Opens 8:00 AM Mon

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Tuffy Tire & Auto Service - Grove City

4.4

(523)

6.67 mi

2131 Stringtown Rd

Grove City, OH

Closed

Opens 7:30 AM Mon

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Blackstone Complete Auto Care

(39)

6.77 mi

4800 Sinclair Road

Columbus, OH

Closed

Opens 9:00 AM Mon

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Boyd's Tire & Service - Columbus

4.7

(189)

7.23 mi

5263 Godown Rd

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Closed

Opens 8:00 AM Mon

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See All 30 Locations

Tuffy Tire & Auto Service Center - Grandview

4.7

(85)

2.39 mi

1524 W 5th Ave

Columbus, OH

Closed

Opens 8:00 AM Mon

Call