Bank 1, System too lean Bank 1?

Tiny
FERNAN0411
  • MEMBER
  • 2002 MAZDA PROTEGE
  • 4 CYL
  • 2WD
  • MANUAL
  • 158,000 MILES
2002 Mazda Protege5 2.0L WD 158000 miles. The code gave me "Random/multiple Cylinder misfire, Intake Manifold tuning control CKT open bank 1, System too lean Bank 1" can you please help me find the result of this problem. Thank you!
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Thursday, August 19th, 2010 AT 12:30 AM

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Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,005 POSTS
Hi,

The reference to "bank one" is usually used on a v6 or v8 engine. There are two sides to the engine, so they have two banks.

On your vehicle, there is only one bank because it is a 4 cylinder.

Since you have a lean mixture, chances are there is an engine vacuum leak or low fuel pressure. To get you started, here is a link that explains how to check for and repair an engine vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If no leaks are found, I recommend testing the fuel pressure to confirm the pump is producing what the engine needs to run properly. Here is a link that shows in general how it's done.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you look at the attachments below, they provide the directions specific to your vehicle. Additionally, they include the manufacturer's fuel pressure specifications.

I hope this helps. Let me know if you have other questions.

Take care,

Joe

See pics below.
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Friday, September 24th, 2021 AT 10:12 PM

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