How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 29447
Experience:  GM Grand Master Technician 2007. 14 years experience.
10949255
Type Your Pontiac Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

2003 Pontiac Montana: a check engin light..P0135..replacing..O2 sensor

This answer was rated:

I have a 2003 Pontiac Montana with a check engin light on . A scan came up with 2 codes a P0131 and a P0135 . What should I check before replacing an O2 sensor . Thanks Don

GM Tech (Cam) :

Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.

GM Tech (Cam) :

Is the fuse 10 in the underhood fuse block good?

Customer:

don't know

GM Tech (Cam) :

PLease check, those 2 codes are for the heaters to the oxygen sensors and both feed off that fuse.

Customer:

can you wait if I check now?

GM Tech (Cam) :

sure

Customer:

OK back in a minute

GM Tech (Cam) :

ok

Customer:

Number 10 shows to be cooling fan relay?

GM Tech (Cam) :

ok look for the O2 sensor.

Customer:

ecm sensor ?

GM Tech (Cam) :

no, check for the fuse for the O2 sensor in the label of the fuse block .

Customer:

no O2 sensor in this block

GM Tech (Cam) :

let me look again, one momeny.

GM Tech (Cam) :

HOw about IGN 1?

Customer:

yes

Customer:

i will checkit now

GM Tech (Cam) :

ok

Customer:

fuse is ok

GM Tech (Cam) :

Then you have bad wiring tot eh o2 sensors, can you test the pink wire for power?

Customer:

I will can't right now . When I bought the van last year light would come and go , but has stayed on for the las 6 mths .

GM Tech (Cam) :

OK you need to test that.

Customer:

Thanks

GM Tech (Cam) :

Please reply back if you need additional help or press ACCEPT If my answer was helpful. You can reopen it at any time by replying to it and I will answer ASAP. PLease keep in mind that as experts on this site, we are only compensated for our time spent helping customers once ACCEPT is selected. Be sure to bookmark this page (CTRL D) to reply with results or ask more if you need. Thanks again for using Just Answer. Cam.

Customer:

thanks

GM Tech (Cam) :

You are most welcome .

GM Tech (Cam) and 2 other Pontiac Specialists are ready to help you

Related Pontiac Questions