ok i gave in and went to a dealership to figure out my prob

[Joseph_98]

ok well i went to a dealership to have my car diagnosed and i got absolutely nooooo where.. my car is throwing up a p0131, p0137, p0151, p0157 the only thing the told me was its my o2s reading low voltage... well no kiddding i knew that weeks ago... but they said i should replace them they showed me on there scanner that it was jumping slow and dropping to low 60s on the voltage or whatever.. but the thing is if the car is acctually leaning out ... wouldnt that drop the voltage on the scanner... i dono what to do to fix it.. this is making me crazy!!!!!!!!

[pajeff02]

Headers?

[transamtom]

Did you do headers?

Did you extend the harness your self?

or did you use the proper extensions or longer wire O2's?

[transamtom]

Headers?

Sorry I just got to this thread,I had about 10 threads open so I didn't see your post.

[Joseph_98]

no headers

extend what harness?

and i did not extend anything to the o2s?

[transamtom]

no headers

extend what harness?

and i did not extend anything to the o2s?

Some people extend the O2's after doing headers by cutting the wire in the middle and soldering extra wire in.

This drives the computer batty as it reads low voltage.

In your case clean your MAF and if the codes persist change the O2's.

[Joseph_98]

i checked for vacuum leaks because how bad it stumbles and hesitates . couldn't find anything yet.. and my fuel system is 60 psi a few months back my friend put in some oe boshe o2 sensors.. and it was doing the same thing before he installed them...but before he changed them all out it was only reading one bad one ........so as of now i have tried these fallowing things...

Ok ..
I cleaned the mass air flow sensor
I checked fuel pressure 60 psi all the time
I ran injector cleanor threw it
I also deleted the pcv system.
..

Only mod is borla exaust

things i think it could possibly be

mass air flow messed up
spark plug wires
egr vac leak
maybe a short in the o2 sensors wires
o2 sensors

any other things you think might be able to fix this would be very appreciated...

[Joseph_98]

what kind and were should i get my o2 sensors ?

[JayTA98]

I always heard boschs are good any autoparts should have them. are you sure your buddy pick up the right ones correct? are you the one that had the universal sensors installed?

[Cutlass]

With all 4 of those codes at once, my very first thought would be, "no way in hell are all 4 failed low at the same time." There must be some reason all 4 sensors are reading low. Do not replace your sensors yet.

Here are some reasons why the sensor could be reading low:

The PCM sets this DTC when the vehicle runs out of fuel.

Heated Oxygen Sensor (HO2S) wire: Sensor pigtail may be in contact with the exhaust manifold or the exhaust system.

An oxygen supply inside the HO2S is necessary for proper operation. The HO2S wires provides the supply of oxygen. Inspect the HO2S wires and connections for breaks or contamination.

Test for intermittent ground in signal wire between connector and sensor.

Lean injector(s)

Fuel contamination: Water near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a DTC.

Fuel pressure: System will be lean if fuel pressure is low.

Exhaust leaks: An exhaust leak near the HO2S can cause a lean condition.

Vacuum or crankcase leaks can cause a lean condition.

[JayTA98]

I just checked and yes you have all universal sensors. I'm wondering if they got installed correctly. I will say go buy one OEM (not universals just plug in directly) sensor aand swap one of them to see if one of the codes go away but I will hate for you to waste money and not solve your problem.

Is kinda of weird because I did a search in autozone and I cant find any universal o2 sensors for our cars.

[Cutlass]

Oh jeez. Really? If this car has the "splice your wires/universal O2 sensors" in it...then yes, that is your problem. Buy some AcDelco or Bosch O2 sensors

[JayTA98]

Oh jeez. Really? If this car has the "splice your wires/universal O2 sensors" in it...then yes, that is your problem. Buy some AcDelco or Bosch O2 sensors

OP if you can buy two (or at least one) new OEM style plug in sensor for upstreams and change those. If the codes go away for the upstream then there was your problem. The upstreams should make your car run better.

[Joseph_98]

its the mass air flow.. and i already switched out the o2 sensors with the oe ones... but the codes still were coming up.. i swapped out my mass air flow and its fine now.. so problem solved ...

[SMWS6TA]

did you swap it out or cleaned it up?


Glad your fixed.

[JayTA98]

Nice to hear that is up and running. I think he swaped it out. He cleaned it before.

[Joseph_98]

ya swapped it out.

[Joseph_98]

thanks you guys for helping me figure this shi@ out!