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code p 2238 refers to heated oxygen sensor(HO2S) 1 bank 1 positive current control --circuit low===causes --wiring short to ground --HO2S
also refers to oxygen sensor (O2) 1 bank 1 -positive current control --circuit ;ow==causes --wiring short to ground ---O2S
also refers to heated oxygen sensor 1 bank 1 ---implausible signal===causes --wiring short to positive, short to ground --HO2S---ECM
at this point I suggest changing the heated oxygen sensor in bank 1 exhaust before the cat converter using the specialist tool as the sensor wires are delicate and subject to easy damage
Yes the airflow meter is very easy, it is in the air intake hose to the engine from the air cleaner. Boy those Japanese car makers really take you to the cleaners on repairs, that repair on a GM car would have been 1/2 that amount.
There will be more than one oxygen sensor. They are located in the exhause manifold, and just after the catalytic converter. Changing them is very easy. You will need an oxygen sensor socket (available at part stores for around $10). Then the sensors just unscrew and screw in.
12 is battery has been disconnected recently, or went dead. 51 is Oxygen sensor stuck on lean mixture reading 21- no change in oxygen sensor reading 53- internal problem with logic module 55- is end of message/codes.
51 & 21, basically telling you same thing, but I wouldn't jump at changing oxygen sensor first, as a bad M.A.P. sensor can cause a rich mixture, thus oxygen sensor switches to lean to try and compensate. Personally, I'd go with map sensor first, check connections and vacuum lines if all good, replace it, then I'd go to oxygen sensor .
PO133 indicates that your front oxygen sensor is not controlling the engine properly .. thats usually a bad oxygen sensor .... in some cars thats easy to change. you could do it if you have any mechanical abilities .. in other cars its nearly impossible, it takes special tools and patients beyond human .. hopefully yours is one of the easy ones .. the part itself might be less than a hundred bucks at an auto parts store but more than that at a dealership . other things that can cause this ... if the wires going to the oxygen sensor are damaged .. and if there is a significant exhaust leak (you should hear that) .. usually changing the oxygen sensor will fix the problem ..it has wires going to it and it screws into the exhaust system somewhere between the engine and the catalytic converter. if you give your auto parts store the make, model, year and engine size of your car then they can probably show you where to find the sensor .. if you are not mechanically inclined then find a mechanic with a good reputation forget lowest price .. i find that often the auto parts store can recommend someone if you ask ..