Question about 2003 Toyota Corolla

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Lean bank one on my toyoata corrolla code scan

Lean bank one,( code scan readout) is what i'm getting when my check engine light comes on, this has happened twice so far in the past three or so months, and this time the check engine light is staying on. engine feels like it is misfiring at times, when car is idle and warmed up. what might be the problem?

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  • ernesto villarreal Mar 10, 2009

    I appreciate the quick response, i will try changing the plugs this weekend, thanks

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I would try replacing the spark plugs. The lean code can be caused by an ignition miss as the oxygen isn't used up completely in a misfiring cylinder.

Posted on Mar 10, 2009

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This DTC is a very common issue on the V6 and refer at the little rubber elbow on the PVC wears through.

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Those lean codes are for a lean fuel condition. The first thing I would check is for a vacuum leak. Especially look around the PCV system. Look for soft or collapsed hoses in the PCV system, (especially the rubber elbows) these are very common issue for failure and cause of lean codes. Also check around the intake manifold for leaks or any other hoses that may have come off.

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Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
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A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
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