hey mates, I jsut bought a used 350z radoster 2004. it needs a little work but a i got it very cheap.
I ran the auto zone codes and it came back with these codes:

P0138
P1148
P0158
P1276

this car has a really cheap aftermarket air filter on it but no other mods.

these codes indicate that both bank 1 sensors need replacing and bank 2 sensor 2.

could it be that all three snesors are indeed bad or could one bad sensor throw the others?

thanks so much for your help!

 

You left out some important information. Miles? Probability that 3 sensors are inoperable is slim. One or two failed catalytic converters maybe.

If you want to begin buy-and-replace troubleshooting, I recommend that you begin by replacing the secondary (the ones AFTER the catalytic converter) sensors.

 

mileage is 133,000.
DO you happen to have a photo or diagram showing where these sensors are and which ones are AFTER the converter?

thanks again for the help!

 

so those codes keep coming back after you reset them?

codes that only show up once dont matter much

 

hey mate,
I have not had them reset. do i need some special equipment to do that? if so what? thanks!!

 

also what colors are the sensors that you are suggesting replacing and how difficult will it be?

 

It's saying all 4 of your oxygen sensors are bad. It's an easy fix. Buy the NGK plug and play off Amazon and just replace them.

 

2 sensors. One before and one after the catalytic converter. Before means towards the motor. After means after the catalytic converter.

 

thanks again for the help guys! that chart witht he part numbers was also very helpful. I ordered the POST cat sensors to replace those first. I will report back once that Has been accomplished. when it says left, does that mean left when i am in car or out of car looking at motor? thanks! Nick

 

unplug your battery overnight. that will reset the codes. then see if they come back

 

K I will try that tonight after i remove the awful air filter thats on it and put on the jwt filter. will report back

 

Left right do not know.
Bank #1 is the same side as cylinder #1
Bank #2 is the same side as cylinder #2.

 

ok I got the JWT filter in and reset the battery. I went for a 15 minute ride and had no check engine light. got home, cranked again and got the light. Not sure if its the same codes though because I don't have a reader but I assume that they are.

 

are these the post CAT O2 sensors? and can you see the pre CAT o2 sensors closer to the engine? thanks! Nick

 

Maybe you should let mechanic take care of this.

 

Lol.

 

Is he for serious?

He is for serious isn't he?

Oh dear god this is for serious. Step away from the car....

 

lol why? are not the blue and green connectors the post cat sensors? i was just confirming before i went at em....

 

the pre cat sensors are the sensors in ur manifolds and the post sensors are the ones in the cats. bank 1 is on the passenger side and bank 2 is the drivers side. but yea u should just take ur car to a skilled tech cus u seem to have low knowledge of this, no disrespect intended just dont want u to mess up anything on ur car.