Question about 2003 Chevrolet Impala

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Have a 2003 Chevy Impala. Check engine light remains on. Scan showed O2 sensor. Could it be a vaccum leak?

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  • Donna Brown
    Donna Brown Mar 13, 2009

    Bank 1.. A friend told us sometimes a vaccum leak could make the engine light come on and show its the o2 sensor.

  • Anonymous May 18, 2009

    my message center keeps popping up saying tighten gas cap i replaced with new at recomendation of dealer still keeps coming on

  • Anonymous Mar 16, 2014

    Check engine light is also on

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Bank 1 is the rear O2 sensor, but experience says to change both. The front one is right behind the engine in the middle of the engine compartment. The rear O2 sensor is on the top of the exhaust pipe, just behind the catalytic converter. But the same code that shows it is the O2 sensor (which is P0420), is the same code for the catalytic converter, or a vacuum leak. Make sure if you do change the catalytic converter, ensure that the new one is OBD-2 compliant. And the vacuum leak could possibly come from the manifold gasket. Let me know what the problem was!

Posted on Mar 26, 2009

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You have a bad o2 sensor what bank 1 or 2 which sensor 1 or 2

Posted on Mar 11, 2009

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My 2003 chevy impala it will turn on in runs about an hour n it will start to pull n tries to turn off but i put it on neutro n it will stay on

Posted on Dec 17, 2012

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1 Answer

Impala o2 sensor


1. Reduced fuel economy
2. Increased exhaust emissions
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4. Engine check light appears
5. Engine stalls during idling
6. A rotten egg odour emitting from the exhaust
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In my 07 impala my engine light is on. both mufflers have big holes in them. will this throw off the oxygen sensors and give me an error reading? when i got it checked it said evap emission ckt check,


The ECU doesn't usually detect muffler issues since they are located beyond the emissions portion (mufflers are essentially for noise not emissions) Mufflers usually have small holes located on the lowest rear-most part to allow condensation to escape. If the holes are big enough for a pencil to fit in, yes you have rusty mufflers. They aren't the problem most likely, but that rust indicates age and poor condition of the entire emissions system. Most issues are in the form of leaks (vaccum or EGR) or sensors O2, MAP or MAF, or you could have a clogged catalytic converter all can be checked by a reputable mechanic if you are overwhelmed.

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I have a 05 chevy impala check engine code p0036 n p0142 bank one sensor two which sensor do I replace


If you have access to a scan tool, check the signal voltage for the Bank 1,3 oxygen sensor with the engine at normal operating temperature. Is it stuck low currently? If so, increase RPM for a few seconds and see if it affects the reading. If it begins working with increased RPM, check for holes in the exhaust near the O2 sensor that may cause a false lean. If the exhaust pipe is intact, the sensor is sluggish, replace it. If the Bank 1,3 O2 sensor voltage reading remains low with increased RPM, unplug it and then observe the reading. It should have increased to about 0.5 volts or thereabouts. If it did, check for water intrusion or other connector problems. If none are found, replace the shorted O2 sensor.

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1 Answer

Check engine light code says i have a lean condition in bank 1. car is idling very rough. possible culprits?


It is most likely your bank one O2 sensor, or a possible vaccum leak, if those two check out ok then check the exaust for leaks.

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Check engine light keeps coming on in my 2003


there are two reasons why this code will set 1st is a vaccum leak next is a bad mass air flow sensor if you have access to a good diagnostic computer you can read live data to pinpoint the problem if you don't have access try to find the vaccum leak in the engine compartment if there isn't one replace the mass air flow sensor

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Loosing power


Wow, I just went through the same problem and guess what it was a clogged converter and a bad oxyegen sensor. The garaged fixed it up for me by putting an eco converter on it and a new O2 sensor. I have a 2003 Chevy Impala,V6 3.8 engine. Good Luck!!!!

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