Mshrmhd

my car is reading a code 44 and 45 .... they are the lean o2 sensor, and the rich o2 sensor... i just replaced the sensor about 4 months ago... and i think the light has been on pretty much the whole time since then still. check engine light is not on at all times.. is there something i have to do to anything after i replaced the sensor? any questions needed answered lemme know thanks for help..

camarogirl18

iTrader: (2)

does your car have a MAF sensor? because everytime SES light would come on mechanics said computer showed "code 44 lean exhaust" they replaced O2 sensors numorus times & then finally one day it shut off & i had to have it roll-backed & i took it to an electrical shop & it was the MAF sensor

91FireChicken

that's possible, I'd think... aren't the MAF sensor and O2 sensor similar sensors? just on different sides of the engine? one measures air coming in, one measures air going out? I don't know if there's a separate code for the MAF going bad....

camarogirl18

iTrader: (2)

have you tried resetting the computer??

three different guys have told me that "code 44/45" are the MAF sensor

Mshrmhd

ill try to replace the MAF when i get some $... ive disconnected the battery a lot of times, Advanced kept giving me bad batteries, bastards. disconnecting battery is how you reset computer, right? i cant remember. my friend has my book in his garage.. he has to tear apart his motor to get to the cam.heh i think id rather have my problem... thanks guys.


hmmm i just realized i dont know where the MAF is.. my car is a 90 so im sure it has one..

camarogirl18

iTrader: (2)

yeah your car might not have it... it depends if it has that speed density update on it...if you do have a MAF sensor they are expensive (atleast around here) & if you have to keep replacing it, like i do, then it becomes REAL old after awhile...yes that is how you reset the computer by disconnecting the battery ***d@mn computer & MAF ***

Mshrmhd

hmmm maybe ill just let it go for a while, will it mess anything up bad? or gimme real bad gas mieage .... i get about 16 mpg on highway... i think thats cuz my fuel injectors need cleaned, they putter every now and again... keep adding fuel tank injector cleaner, fixes for a while, oh well,.. thanks again

Morley

If it is a 1990 you'll be hard pressed to find the MAF sensor, it was replaced by a MAP sensor in 1990 ala "Speed Density".
Disconnect the battery and leave it disconnected for 20 minutes or so and try it again. If you can, hook a scanner to the ALDL and see exactly what the O2 readings are when the codes get set.

Vader

Toadstool,

What model/engine/fuel system do you have? If it's a '90 V-8, you DON'T have a MAF sensor, and it probably wouldn't contribute to a '44' or '45' either.

Cruzin Kaz

Oops.. wrong thread. Sorry.

Mshrmhd

Car is a 90 3.1 MPFI stock ... does it have the MAF ?

hehe.. my 3.1 blew the hell outta my cousins 81 camaro with a 3.8 setup for racing... hard. i was actually embarassed for him how bad it was. and he thinks it can take my chevelle... pfft.

Vader

Mushroom,

In 1989, the 3.8L Buick V-6 in Buick/Olds/Cadillac products (BOC Group) switched from analog Bosch to AC/Delco FM MAF on high-performance engines only. All other 3.8L and V-6 engines used speed-density systems - including yours. This means you have no MAF, but a MAP sensor instead.

The DTC 44/45 are for and oxygen sensor lean and rich, respectively. Getting both of them without a '13' or '55' (oxygen sensor failure) can mean a leak into the exhaust system, failing TPS, leaking injector/regulator, poor O² connection or ground, incorrect fuel pressure, and other problems.

I'm guessing your engine looks like this:

Mshrmhd

hmmm... would this be why every now and then my car makes a puttering noise when gas is pressed? my brother told me it sounds like the injectors need cleaned...

There is something weird about that picture...i think my alternator and a/c pump might be the difference? i think the alternator is on left and a/c is on the right... and the radiator maybe... i think the radiator opening is on the opposite side of the battery? dont really remember that tho.. maybe its just because my car is MFI isntead of TBI though? maybe my radiator opening is on the right ... the intake hose goes from the motor towards the front of motor, then goes left, then down. if its important, i could post a pic of it..

or are firebirds A/C and alternator opposite sides of a camaro?


and thanks alot for the help.