Question about 1997 GMC Yukon
1Emissisions- Related Powertrain DTC's Mode 3, 2Mass or Low Air Flow Circuit Low Input, 3Sensor Heater Malfuntion(bank1Sensor2), 4Random/Multiple Cylinder Misfire Detected, 5CatalystSystem Efficiency Below Threshold(bank2) I would like to change any sensors i can myself but i dont understand what this means. As far as the misfire ill take to a mechanic myself please help.
Your best bet take it to a qualified repair shop that can do the diagnostics for the codes, no code tells you to replace a sensor . Viewing scan data on a professional scan tool an doing diagnostics
CatalystSystem Efficiency Below Threshold(bank2) ! This means you need to have a catalytic converter replaced .
080 EGR and Catalytic Converter Tests EGR Test
Posted on Jun 28, 2017
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Posted on Jan 02, 2017
SOURCE: 97 taurus flunked DEQ
the cam sensor is located to the back of the engine (meaning to the right end of the engine where the transmission is bolted to it) P0340 most commonly is the sensor and what they call the syncronizer you will have to replace them both but be aware that this code can be caused by a wiring concern or a pcm concern,to replace the cam sensor/syncro you will need to make sure the engine is timed properly othewise the code will come right back,they make a timing tool that really should be used when doing this but I have done them in the past with out it and never had a problem.As for the p0430 it means your catalytic converter has went bad and will also need replaced as I recall there are 3 cats on this car p0430 means bank 2 which is the one on the front of the car but I reccommend to replace them all at once because as soon as you get the one replaced the others will start acting up.One other thing do not let someone sell you sensors for them as this will not fix the concern.
Posted on Oct 04, 2008
That's a pretty RELIABLE code!... You have a bad CAT (Catalytic Converter). Trust it to be accurate. The conditions which set this code is when the Upstream O2 sensor's data/signal is compared to the Downstream sensor's data/signal... when they are nearly identical, that's when this code is set (unless you have an exhaust leak).. If there is an exhaust leak.. repair it, then retest/recheck.
Posted on May 31, 2009
it can be two things the cat pluging up or the evap canister valve is stuck open or the fuse is blown check fuses first if ya need more help post here and I will give ya some more info.
Posted on Aug 20, 2009
SOURCE: Check Engine Light ON
What codes come on? P0420
The converter's only purpose is to reduce emissions from the engine, in rare cases the converter can disintegrate which could result in a loss of power but this is not very common,
This means that you're Cat needs repair or replacement, You're car will not pass legally smoged without fixing this. :
Posted on Sep 04, 2009
Testimonial: "Thank you very much, however the light was ON after it passed the smog test"
sounds like a vacuum leak is causing the problem. consider this. idle bypass valve can be going bad or is bad.
if the engine is getting weak fuel pressure you should see a fuel light come on when this occurs. indicating improper pressure, witch the car running quickly tap the gas pedal.
now dose the problem happen in only cold weather so far? or also hot?
if not then your fuel pressure regulator is faulty.
i suspect the fuel pressure regulator myself but this is a procedure to help you determine it.
Posted on Dec 13, 2009
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