Question about 2000 Saturn L-Series

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Engine stalls when restarted idles up and down and stalls

Got several codes when I first started checking the problem. Replaced the O2 sensor bank 1. problem I thought was solved.I still get the code PO102 which says MAF or VAf low voltage. now my vehicle is back to stalling and when I restart it ;it sometimes will idle up and down then stall,when restarted it will run fine until the next time this scenario happens.This is the only code I have now.When I cahnged the O2 Sensor Bank 1, I thought I had problem fixed? The MAF sensor was replaced about 2 years ago. I hope that you can help,Thanks.;

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I went through this scenario while working in a toyota sienna a few months ago and it ended up being the battery. When battery supply voltage starts to drop the PCM will limit voltage to certain areas.

Posted on Jan 19, 2009

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What can cause a 2005 Hyundai Sante Fe check engine light to come on and get all these codes: p0134 - o2 sensor circuit no activity detected (bank 1 sensor 1), p0151 -oxygen sensor circuit,low voltage...


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I have a 96 k1500 chevy truck and have 4 codes that pop up on the check engine light randomly. Codes are ckp A signal intermitent, cmp out of range, idle contol rpm to high, O2 bank 1 sensor 1 insuficent...


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Sounds like Idle air control sensor bad, All of your codes interact, I would start with 02 sensor.

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1 Answer

PO420 CATALYS INEFFICIENCY BELOW THRESEHOLD BANK 1.REPLACED CAT, 02,?


The PCM copares switch rates between the front O2 sensors and the downstream catalyst moniters. The catylist moniters are often mistaken as O2 sensors, and they are, but that is not their job, or what they are called.
By comparing the switch rates between the front (before cat) and rear (downstream of cat) the PCM knows if the cat is affecting the exaust, and how much it is affecting the exaust.
If it sees little or no effect o the exaust gases that have passed through the cat, then it decides that the cat is not working anymore, and sets a P0420, or a P0430, depending on which bank it is.
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If the cat is working right, you should see a fairly rapid switch rate, probably 5 or 6 times a minute on the front O2, but almost a flat line just above .5 volts on the rear. If the rear is switching often you proabably need a catalytic converter.
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The engine may stall when you restart it, let is stumble and stall. Just restart it, the ECM is relearning the sensors like it was the first start up the engine ever had then go for a test drive.
This should reset everything and turn your check engine light off, if the check engine light came back on, have it scanned again at Auto Zone, Parts source where they scan free of charge and address the issues the DTC codes points out.
The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those syptoms are there, the converter likely needs replacement.
Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll want to check the operation of the O2 sensor. To do that, you'll need access to a scan tool or oscilliscope. Check that the waveform is pretty steady. If the reading fluctuates then the sensor is likely bad and will need to be replaced as mentioned earlier.
Thank you for using Fixya and be safe.

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