Question about Ford Mustang

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I did change both oxygen sensor and the light is still on I must say that the car is running good but the light still on I did change also map sensor and every things but the light still on what is the problem??

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What year is your Mustang? Is there a ecu connector / OBD2 switch under the driver side dash? If so the codes can be cleared manually. I had a similar issue on my gf toyota avalon and I read that sometimes a ecu fails to recognize the work being done mechanically. Another trick with eliminating the problem of a engine light/code showing try and disconnect your negative battery cable from 20 minutes then reconnect it drive car for a bit see if code is gone/comes back. Hope this helps ya

Posted on Nov 17, 2013

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Posted on Jan 02, 2017

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SOURCE: truck starts, dies. truck runs good some days,bad the next

I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!

Posted on Oct 06, 2008

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SOURCE: I have 96 gmc 350 vortec. missing really bad. Ive

ou need to check compression on all the cly. do you know which cly is dead?

Posted on Jun 12, 2009

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SOURCE: Car started hesitating then died

replace the fuel filter,if this does not help,replace the fuel pump.

Posted on Mar 03, 2010

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SOURCE: 94 camry. 2.2 fed emissions.

Before we both knock ourselves out with fuel injector testing. Hook up a Digital voltmeter (DVM) to upstream O2 sensor and lets see how she is burning. Remember positive lead of DVM to signal wire and negative lead to ground. Anything above 550 mV is rich anything below 350mV is lean. Be mindful that an exhaust leak the size of a pin hole in this region can cause a rough idle. A healthy reading should bounce between 550mV and 350 mV.
Next to test is O2 is working block off air in take making mixture rich and see what O2 says about it . Then pull off a vacuum hose (a lean condition) and see if DVM drops to 200to 300mV's.
Keep me posted.

Posted on May 10, 2010

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SOURCE: My Honda Accord 2000 runs great but the check

p0700 generic trans failure...p0780 mis shift code
1470 is diagnostic pump failure... you cant fix it on the street...

Posted on Jun 17, 2010

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Has codes 14 52 and 55 will not pass smog car runs fine the hc (ppm) are901 and the co is10.27

14 = MAP sensor voltage below .16V or over 4.96V
52 = Oxygen sensor stuck at rich position
55 = End of codes (not a fault code in itself)

Would appear that you have either a bad MAP sensor, or a leaking vacuum line somewhere.

The bad readings from the MAP sensor will cause the trouble code with the oxygen sensor (and the reason why you failed the test,) but this is not to say that the oxygen sensor can't be bad also.

Start with the cheapest thing, tracing vacuum hoses and lines for cracks and/or leaks. There should be a diagram somewhere under the hood that shows you the routing of the lines, attached to the underside of the hood or possibly on the front area near the radiator. With the age of the vehicle, I wouldn't doubt that this is the problem.

If everything checks fine with the lines, then try replacing the MAP sensor. These do have a tendency to fail.

Good luck, line tracing is bot a fun job, I've been there many times.

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