It means catalytic converter.

 

Bad cat can be caused by a bad MAF or bad coils. So, these codes are at times hard to pinpoint.

 

thanks.....got lost on that one.

So essentially I may replace the MAF only to keep working my way down to the pre-Cat then to the other Cats?

Man this is a Big SUCK!

 

Well, I'd say MAF fist since it is the cheapest and easiest to replace.

 

I am going to do the MAF. The best price i found in town was 104 bucks. Is that a good price? This is for a stock unit.

Thanks Everyone.

 

replaced the MAF.....guess what it's BACKKKKK

what the Fudge.

also noticed that the Intake Aircontrol IAC which at idle should be 9-15 is at 23-26 on mine? Does this indicate anything else?

and
EGR should be at 2.5v when warm and idling and mine is at 1.34v and never seemed to change with throttle/RPM, not sure if it should...

Help Please.... AND a big thanks for all the help and anything else you can add.

Starting to hate the Max......

 

+1

 

Maybe you need to get an ECU reflash to match the new MAF.

 

I have read both ways about the reprogram of ECU after a new MAF.

Is it normal that a reprogramming is needed?

Or is it normal that you should be able to plug in the new MAF and go?

One thing is for sure the car really does have it's power back with the new coils--plugs and MAF.

How much does a dealer charge to reprogram the ECU? I know it will vary but kind of looking for a range so I know if the Dealer is trying to charge too much.

Thanks everyone..

 

Only if symptoms still persist.

If all is fine, then, no, there is no reason.

Check into your IACV before going for the reflash.

 

thanks!

So amazing that one code covers so many parts.

 

The issue ended up being after market coils. I went back to OEM and code went away.

Long story...........ugh..

 

HI all .. Im new so plz dont take me wrong .. if im posting at the wrong section . cuz i dont have much option ..
..
have 02 maxima se. i know quite a bit abt car but i guess it wasnt enough. i felt my car was eating alot gas ... after opeing the hood to change the plug. i found valve cover gasket leak .. so replaced front and back valve cover gasket and plugs .. Plus .. i clean my TB .. which was a mistke .. i open the TB and open spry the whole thing .. put everything back on .. my ideal went up above 1000rpm oh god .. check egine light came on couldnt deal with it .. so took it to the dealer .. and they give me code .. .PO507 PO223 PO123 P1800 and quote me with $1400 guys i fall from the sky .. poor me what els could be done i agree to do the job .. it was .. replacesd TB chamber Assembly .. MAF sensor and Vias Sensor. REcalibrated ECM .. i have no idea abt these last 2 . ok now back on road no check engine light on .. but i feel something is not useuall .. the car runs fine .. when my foot at the gas paddel but when i step on break .. the rpm should go all the way down right .. but its seem like its going going down and bhoom jump up a little and then gose down .. i didnt notice that b4 i mess around with the car .im sure its not normal .. why the rmp will jump up a lil when ur foot on the break right ? so plz tell me what should i do now and what can be the problem .. by the way talking my car back to .. dealer tomorrow but still will like to know so plz help me knowing!