What's the code?

 

Not sure if this is what you need but this is all auto zone gave me, oem number to cross PO442, PO135, PO988, PO455. Two said vacuum, one was o2 sensor, and one was transmission lol

 

PO442-Evaporative Emission Control System, Small leak detected
PO135-O2 Sensor Heat Circuit Malfunction
PO988-Unknown
PO455-Evaporative Emission Control System leak detected (no purge flow or large leak

 

So some sort of vacuum leak, where do you suggest I start?

 

nope not a vacuum leak.

make sure your gas cap is on tight first. it should click a few times when tightning

if it still comes on we can do into the evap system deeper. that is usually the problem though

the o2 heater malfunction is a problem by itself. it would not be one because of the evap leak issue

 

Gas cap seems to be ok, I just went out and turned it a few times and it clicked... Will reset battery and see what happens. What is the o2 heater? All I knew there was is o2 sensors haha. Usually work on older vehicles

 

Its a heater circuit in the o2 sensor that insures it is at the proper operating temp for accurate readings

 

So basically I need to replace both o2 sensors

 

No the p0135 code is for the first sensor in the manifold

And it may not be the sensor. Check wiring as well. While not likely- the wires could be melted or
haffed

 

x2

I just replaced both o2 sensors in mine and the brand new sensor1 bank 1 is apparently bad. no codes before but idle was rough and surging.

did all other normal maint to do with rough idle like TB MAF etc

put in both new sensors and now have a p0135 code with the new sensor.

waiting on a replacement ordered.

 

dont think the gas cap is the problem, reset the battery and everytime i get gas i make sure it clicks 4 or 5 times and drove it probably 45 miles and check engine light kicked back on :th_crazy:

 

I have the same problem with hearing a vacuum leak under my hood. It's located in the housing right after the throttle body. The hose connects inside the housing to my top end. The code I got was for MAF. I checked my sensor its good. So tomorrow I plan on taking apart the housing and checking out the hose and connectors.

 

i just got the engine light as well yesterday
i had the code cleared, has not came back up yet...

 

The hissing noise is from the PCV breather hose doing a 90 degree turn, and the turbulence of the air going around the bend in the pipe. There's no vacuum leak. You can do a search on this issue. I believe there's a TSB on it, but there's no prescribed fix per se.

The evap code might be your gas cap so please check the easy shit first.

Do some testing on your O2 sensor to see if it's bad or if the wiring has a fault.

 

Are you using a brand name sensor, Bosch, ACDelco, or Denso? "Generic" sensors can be problematic.

 

HA! wish I had known that. already purchased so I guess I will wait to see if the second one is any better.

it seemed the first one was good for a whole ten minutes of driving.

the part has a 10 year warranty so we will see what happens.

 

Denso FTW

 

FTW??? whats that mean?

 

Oh sorry. It means For The Win.



Acdelco and Bosch are great brands as well.

 

yeah I am not even going to use the new part that comes in...

I applied copper anti-seize to my old o2 sensor and cleaned it put it back in and that error p0135 is now gone. Mechanic told me don't bother changing it. he says truck is screaming to have it's fuel pressure tested.

While I had both o2 sensors off I tested ohms in the heater circuit and the "new" one said 16ohms
old one said 5 ohms

so the circuit is not "bad" in the new one but it's resistance is clearly out of range as far as the PCM is concerned.

 

Hi everyone) If u have problems with cleaners u should c this website Robot vacuums