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Codes read random misfire

Code reader says random misfire also says fuel running lean on 2 o2 sensers

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Change bottom 02 sensor

Posted on Jan 22, 2013

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Check engine light code p2196,p2197, po300 ,304,305,306,p2 ,Im freeking out.


P0300 Random/Multiple Cylinder Misfire Detected P0301 Cylinder 1 Misfire Detected P0302 Cylinder 2 Misfire Detected P0303 Cylinder 3 Misfire Detected P0304 Cylinder 4 Misfire Detected P0305 Cylinder 5 Misfire Detected P0306 Cylinder 6 Misfire Detected P0307 Cylinder 7 Misfire Detected P0308 Cylinder 8 Misfire Detected P0309 Cylinder 9 Misfire Detected P0310 Cylinder 10 Misfire Detected P0311 Cylinder 11 Misfire Detected P0312 Cylinder 12 Misfire Detected P0313 Misfire Detected with Low Fuel P0314 Single Cylinder Misfire (Cylinder not Specified) P0315 Crankshaft Position System Variation Not Learned P0316 Misfire Detected On Startup (First 1000 Revolutions)

Read more at: http://www.obd-codes.com/trouble_codes/
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P2195 O2 Sensor Signal Stuck Lean Bank1 Sensor 1 P2196 O2 Sensor Signal Stuck Rich Bank1 Sensor 1 P2197 O2 Sensor Signal Stuck Lean Bank2 Sensor 1 P2198 O2 Sensor Signal Stuck Rich Bank2 Sensor 1

Read more at: http://www.obd-codes.com/trouble_codes/
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May 07, 2015 | 2006 Ford Taurus SEL

2 Answers

2000 chevy silverado p0171 ; p0174; p0300


Sounds like you have a serious vacum leak.; DTC 0174 and 0174 are lean conditions on bank 1 and bank 2, 0300 is random misfire. The only thing I can think of is a big vacum leak like the brake booster / vac line leaking, or maybe the intake manifold is cracked ... even a stuck-open EGR doesn't normally lean a motor that much. Start by checking for a vacum leak, if the motor will idle you can spray a little WD-40 around ports and lines >> if the idle speeds up or becomes smooth you on the right track in the area you judt sprayed.

Feb 26, 2015 | 2000 Chevrolet Silverado

1 Answer

Have codes indicating bank 2 running lean(po174,po153,po159) also have codes for misfires on all cylinders. Does the misfire trigger o2 codes or does bad o2 sensor cause misfires?


misfire could cause o2 codes. o2 sensors are measuring the oxygen in the exhaust - if you're sending unburnt fuel through there (like a misfire), it would throw the value way off. if you're getting a 'lean' error, I would first suspect a bad fuel injector. But you are having a misfire on all cylinders... I would then look at the ECU as it may be having issues sending the 'open' signals to the injectors.

Oct 18, 2014 | 2003 Jeep Liberty

1 Answer

Random misfire and O2 Sensor


One major problem with mechanics today is they don't test anything, just replace parts.
The O2 sensor codes do not tell you to replace, only to check. Either the sensors are telling the computer the fuel mixture is too rich, too lean, or not changing at all.
I would have someone check base fuel pressure and volume next. You could be low on fuel pressure or the fuel system may be weak enough to be too lean under some conditions.
The coils could be arcing if the mixture is too lean, electricity takes the shortest path to ground. If the mixture is lean the plugs may be too tough for the electricity to get to ground.

May 07, 2013 | Cars & Trucks

1 Answer

Codes reading misfire


Ok, what have you checked so far ?
How old are the plugs ?
Have you checked fuel pressure ?

Jan 22, 2013 | 2003 GMC Yukon Denali

2 Answers

Code 171 engine runs lean ,engine sparks knocks


what should we check when we have those pesky rich or lean codes? The most common issues for lean codes are:

1. Vacuum leaks - check for failed or loose vacuum lines, leaking intake gaskets, intake air tubes loose or any other source of un-metered air leaks (leaks after the Mass Air Flow Sensor)
2. Restricted fuel2_bing.gif filter or bent/pinched fuel system lines
3. Incorrect input from other sensors, such as the Mass Air Flow Sensor, which may not always drop a separate code
4. Engine misfire – Yes I know this one may seem weird. You might think that if there is a misfire then you will have all that unburned fuel and it should read rich; right? Well the O2 sensors read only oxygen content in the exhaust, so if you have all that unburned fuel from incomplete combustion then, you guessed it, you also have all that unburned oxygen. High O2 content in exhaust equals a lean reading! There are also some other possibilities such as an internally leaking EGR system, (but this will typically set a separate code). A leak in the exhaust system before the O2 sensor will also cause incorrect readings. And always check for after- market modifications. These can throw a wrench into the works! The only other possibilities (however unlikely), are wiring issues, computer concerns or a bad O2 sensor! .

May 30, 2010 | 2000 Kia Sportage

2 Answers

PO174 HOW TO CLEAR THE CODE


P0174 is SYSTEM LEAN BANK 2. If you do not have any rough running or missfires. Check for any vacumm hoses that may be damaged or loose. Any code that is set on OBDII has to be cleared with code reader. If you have any rough running or mussfires, check fuel injectors for proper operation. If this helps, please rate.

Apr 30, 2009 | Ford Mustang Cars & Trucks

1 Answer

Lack of fuel when accelerating


This might help. It looks like you O2 sencor had gone bad or the signal has and causing multiple mis fire. according to your codes. 
PO171 System too Lean (Bank 1

PO174 System too Lean (Bank 2)

PO300 Random/Multiple Cylinder Misfire Detected

Causes of PO300
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns

I'ld start with chaning the O2 sensors first but sheck for bad wire connection. Hope this helps and good luck

Apr 08, 2009 | 2004 Ford F150

1 Answer

Starts good when cold, hesitates starting when hot.


ok so you have an oxygen sensor that went bad from the P0175 code and a random misfire code from the P0300. If it is random you might want to check your spark plug wires or spark plugs themselves and see if anyof them went bad. So get an oxygen sensor and replace it. This can also cause the second problem for it tells the computer that it is reading too rich. Well in this case all that unburnt fuel from the spark plugs or wires not igniting properly you will have a reading like that.
The most common issues for lean codes are:

1. Vacuum leaks - check for failed or loose vacuum lines, leaking intake gaskets, intake air tubes
loose or any other source of un-metered air leaks (leaks after the Mass Air Flow Sensor)
2. Restricted fuel filter or bent/pinched fuel system lines
3. Incorrect input from other sensors, such as the Mass Air Flow Sensor, which may not always drop a separate code
4. Engine misfire – Yes I know this one may seem weird. You might think that if there is a misfire then you will have all that unburned fuel and it should read rich; right? Well the O2 sensors read only oxygen content in the exhaust, so if you have all that unburned fuel from incomplete combustion then, you guessed it, you also have all that unburned oxygen. High O2 content in exhaust equals a lean reading!

Mar 23, 2009 | 1996 Chevrolet S-10 Pickup

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