Question about 2000 Saturn SL

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P1133 switching sensor bank 1 sensor 1 wat is it and wat is it please

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  • blake varner Apr 11, 2011

    thanks but its not that old it was just replaced not long ago.but the car is idling rough

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The connector for the rear heated O2 sensor is located on the rear cross bar of the cradle and the usual cause of this code is sensor contamination. The reference air for the sensor is sampled through the connector and the wire to the sensor its self. Look for any oil or other liquids that may have dripped down on that connector. Take a look at the CRC Electrical Connection cleaner at a parts store and see if it is marked as sensor safe. If it is you can clean out the connector. If its not marked and you guess wrong it will be done for. It could be from the carb cleaner used while checking for a leak. there is a lock pin in that connector that keeps the halves mated so you have to remove it to separate the connector. It can also be caused by dirt/corrosion on the connections. Do not grease this connector, it will kill it.

You can clear the code by removing the PCM-B fuse and waiting for 5 minutes or so and then replacing the fuse. Or, you can wait for a couple of key on cycles and see if it shuts its self off.

There are several grounds connected to the block above the starter. One of them is the ground for this sensor. Better check them also as they might have gotten mangled in the manifold replacement. they are right around the corner on the back under the intake and you can see them with a mirror from above. Usually its 2 brown wires, a black wire, and a black with white stripe wire.

Posted on Apr 11, 2011

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This is the front o2 sensor.Will be in the exhaust manifold and look like a spark plug with a couple wires coming out of it.A 7/8 wrench will remove it.

Posted on Apr 11, 2011

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Cvarner2, I don't know exactly what the code is but "bank 1 sensor 1" sounds like you have a problem with an oxygen sensor. This sensor is probably located on the exhaust manifold at the back of the engine. My suggestion is to have the car scanned at a garage so they can tell you exactly which sensor it is. Good luck with this.

Posted on Apr 11, 2011

  • frcemomma Apr 19, 2011

    The O2 sensor is on the manifold actually on the front side though. Same exact codes came up on my 2000 SL2

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Bank 1 sensor 1 is a failure of the first o2 sensor, you can replace this with a cheaper one also, just need to cut the old wire and use the connector, just wire the new one up. A special socket makes it a bit easier, but it is not required. The first sensor is the first sensor that the exhaust flows through, the most important one actually.

Posted on Apr 12, 2011

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