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Posted on Jan 02, 2017
That's a pretty RELIABLE code!... You have a bad CAT (Catalytic Converter). Trust it to be accurate. The conditions which set this code is when the Upstream O2 sensor's data/signal is compared to the Downstream sensor's data/signal... when they are nearly identical, that's when this code is set (unless you have an exhaust leak).. If there is an exhaust leak.. repair it, then retest/recheck.
Posted on May 31, 2009
Need to replace your cat converter. You can do it if you are mechanically inclined. But, most likely will need to be taken to someone with a lift. Yes it will be expensive. Look at $500-1000.
Posted on Mar 16, 2009
Basically the mechanic will make sure don't need a tune up. or have vacuum issues or leakes in the exhaust before the cat. Then he should check the front 02 sensor to make sure its not getting lazy. If all this passes then you will need a new cat. If the O2 sensor has more than 70,000 miles on it it needs to be replaced anyways so you may just want to do this first and hope the light stays off.. The problem with a lean code is you will wear out the cat real fast if you didnt deal with this and kept driving the car. The lean code could have been vacuum leak or a bad MAF sensor or weak fuel pump.
Posted on Sep 02, 2009
The code Im assuming is po420, or po430. In either case it means the catalytic converter is inert and no longer has the ability to convert hydrocarbons to CO.
Posted on Oct 18, 2009
DO NOT ERASE THE CODES. There is Freeze Frame data that the technician may need to print off and attach to the Repair Order if it is covered under a CAMPAIGN. The misfire code P0303 relates to cylinder three not contributing. It could be a spark plug, ignition coil or an injector. I would check these items first before taking it to a dealer. There is also a campaign (RECALL) for the Power Valve (NTB05-058b) where the screws may have become loose. This is located inside the intake manifold.
The P0420 code could be a defective catalyst. The parameters for the catatytic converter may need to be widen through the ECM reprogram. It could also be one of the following bulletins or campaigns (RECALL): NTB09-046, NTB06-004b or CAMPAIGN NTB03-070b (R3007, R3014, R3015, R3016 & R3017). You will need to take the vehicle to a NISSAN dealer to verify if your vehicle is affected by these. Simply ask the service writer to check if your vehicle has any open campaigns. This is free. The bulletins may cost you.
Posted on Dec 20, 2009
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