Re: I changed the battery and now the computer won't...
Did you change the Batt right before the emissions test? If so bad idea. Yes the car needs to be driven for some time before the computer sets up timing fuel and spark carrectly. Drive some more then try the test again, should be ok and pass
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Did you have the battery tested? Check it for water, voltage, and make sure the terminals are clean. It will run the lights dirty, but won't crank over the engine. You need to get a wire brush on them things and scrape them clean. The alternator might be bad, Just because it is new doesn't mean it is good. Check the battery, then check to see if the alternator is charging the battery, the voltage should go up with it running. Hope this helps.
The 1.8 is a 4 cyl. engine . it has only 2 oxygen sensors . Nissan engine controll systems devides its EGO sensors into banks . Bank 1 is the upstream (top before the catylyctic converter) . Bank 2 is the downstream (after the cat. conv.) I recomend you change both for emissions reasons
P0136 indicates a bad O2 sensor. This reports poor emission performance back to the car's PCM (computer) P0325 indicates a bad "Knock" sensor which would adversely effect drivability as far as performance is concerned. Only way to fix these 2 problems is replacement of the 2 components.
You will need a new catalytic convertor assembly. Yours is below treshold efficiency in other words its "no good".If you have it replaced, ask the garage/dealer to give you the old one back. Its worth some cash if its full. It doesn't matter thet it failed. They are going after the mesh inside of it and that is worth some $$$$. May not be much , but better than nothing.