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PO1411 - Downstream 02 Sensor - Please help!


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protege1.6
User

May 24, 2017, 2:32 PM

Post #1 of 15 (696 views)
post icon PO1411 - Downstream 02 Sensor - Please help! Sign In

Hi there,

So I have a 2000 Mazda Protege 1.6L engine if it doesn't already show that on my profile.

The CEL code is P1141: Downstream

I know this code suggests there is an issue with e the downstream 02 sensor,however I already installed a new one in August!

My friend did some voltage testing:

* 5V coming out of the heating circuit
* No voltage coming out the PCM! --------->> What does this mean?

So what else should I check , before I go and buy yet again another 02 sensor??? Gas mileage has deterioted!

Previously I had a po420 cat code, but that didn't come up this time.

Help!


(This post was edited by protege1.6 on May 24, 2017, 2:34 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 24, 2017, 4:03 PM

Post #2 of 15 (679 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

Unplug the sensor and you should have 12v on the orange wire with the key on.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



protege1.6
User

May 25, 2017, 11:33 AM

Post #3 of 15 (655 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In


In Reply To
Unplug the sensor and you should have 12v on the orange wire with the key on.


Which proves?


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 25, 2017, 1:10 PM

Post #4 of 15 (645 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

Power for the heater doesn't come from the PCM. The power comes from the ignition switch (on position) and the PCM grounds the heater circuit to turn it on.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 25, 2017, 1:42 PM

Post #5 of 15 (633 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

Trace the black/blue wire. It comes from the ignition switch.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
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Hammer Time profile image

May 25, 2017, 1:49 PM

Post #6 of 15 (629 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

You're right, I followed the wrong wire but I see it goes through a fuse between the switch and the sensor (engine fuse 10A) in the inside fuse box behind the left kick panel.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



protege1.6
User

May 25, 2017, 4:56 PM

Post #7 of 15 (613 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In


In Reply To
Unplug the sensor and you should have 12v on the orange wire with the key on.


Sorry but I do not have a hoist/ jacks....

Would I be able to do all this with raising the car off the ground?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 25, 2017, 4:58 PM

Post #8 of 15 (609 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

Just check the fuse in the left lick panel. If that's good, take it to the mechanic.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



protege1.6
User

May 25, 2017, 5:17 PM

Post #9 of 15 (605 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In


In Reply To
Just check the fuse in the left lick panel. If that's good, take it to the mechanic.


and if its not?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 25, 2017, 5:19 PM

Post #10 of 15 (603 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

Gee, that's a tough one. If the fuse is no good, what should you do?

Maybe replace the fuse.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 26, 2017, 4:56 AM

Post #11 of 15 (591 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

If the fuse was blown, the engine wouldn't run. The fuse protects the circuits for the O2 sensor heaters and ignition coils.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 26, 2017, 5:06 AM

Post #12 of 15 (587 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

That only leaves the wiring and that is beyond his ability so he is back to taking it to the shop.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



protege1.6
User

May 26, 2017, 9:35 AM

Post #13 of 15 (572 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In


In Reply To
That only leaves the wiring and that is beyond his ability so he is back to taking it to the shop.


If I dont have to raise the car, then its within my ability.

I rewired the harness for my motorcycle.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 26, 2017, 9:43 AM

Post #14 of 15 (570 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

OK, then go ahead and locate the problem.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



TGonnion
Novice

Aug 18, 2017, 12:01 PM

Post #15 of 15 (429 views)
Re: PO1411 - Downstream 02 Sensor - Please help! Sign In

Incorrect advice deleted
Wal-Mart: Auto Care Center Service Manager

2005 FORD CROWN VICTORIA POLICE INTERCEPTOR
2001 HONDA CIVIC EX



(This post was edited by Hammer Time on Aug 18, 2017, 12:30 PM)






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