02 GT dropping CheckEngine Codes.

sevilla · 09-08-2009, 01:09 AM

Today my Stang are dropping the follow codes:
P0135, P0155, P0443, P1451.

It appear to be a bad O2 Sensor, but i dont know why the four codes
at the same time..

I cleared the codes, drived my car around 20km without any checkengine light.
I stopped and turned off the engine.. Again, turn on the engine and the four codes
appear again..

I cleared again the codes, turned on the car. the car went 10min only on idle, not codes, turn off, again turn on and the codes appear again..

What could be the problem?

I dont made any change on the engine recently (only changed intake manyfold due broken plastic where the radiator hose connect to engine without any code some weeks ago, maybe 600 miles ago)

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socalwrench · 09-08-2009, 05:45 AM

Clearing the codes will not solve the problem that is bringing them up. Often times the same sensor can throw multiple codes, especially a main engine input such as the upstream oxygen sensors. If all the codes are pertaining to a bad 02, I would replace it. However, if you want to be sure- you can backprobe the sensor with the engine warmed up and running. A good sensor will be between .1V - .5V (.25V being near stoichiometric {14.7:1}). Depending on your voltmeter, it may switch too quickly and only provide a high or low value, but as long as it's in that range- it should be fine. I would also check the wires because they can often get burned up from the exhaust.

Also, I'm not sure how many miles are on your car, but the typical life span of an 02 sensor is around 60k.

cliffyk · 09-08-2009, 03:54 PM

P0135 and P0155 are codes for the front O2 sensors, P0443 and P1451 are EVAP errors (click on the links to see what the shop manual says about these codes).

I would tackle the EVAP system first, the O2 sensor codes may be firing because of the EVAP problems...

sevilla · 09-09-2009, 12:34 AM

Thnks for your replies..

So, if the problem is the EVAP system, where is located or how can make the test showed on the last links?

sevilla · 09-09-2009, 11:40 AM

Fixed.

I did some searchs on internet about that codes at the same time and all point to be an electrical problem. I checked the fusibles under dash and the #8 was broken. I replaced it and now its works smooth.

Thanks for your replies.