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Engine codes I have codes PO171 & PO300 - PO304. I've already replaced air and fuel filers, O2 sensor, purge valvue, maf sensor and see no vacum line leeks. What's left?

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6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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emissionwiz

Marvin

  • 85206 Answers

SOURCE: 2001 Jetta 1.8T 172 engine code

You may just have a dirty MAF sensor, spray brake clean through the sensor and clear the code, run it a few days to see if the code comes back.

Posted on Sep 16, 2008

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Anonymous

  • 3 Answers

SOURCE: 97 jetta won't start when engine is cold

It sounds like your starter motor could be at fault.

Does it turn over slowly,or not at all with out the jum leads?

Posted on Jun 28, 2009

Franco2112

  • 76 Answers

SOURCE: MKIV VW GTI FUEL PROBLEM

Check all vacume lines for cracks. Throttle body cleaning.

Posted on Aug 14, 2009

paul campbell

  • 1071 Answers

SOURCE: 01247 fault code vw vr6

throttle may need adapted

Posted on Aug 18, 2009

Anonymous

  • 69 Answers

SOURCE: p0171 lean code will not go away. changed fuel

Double check the very small hose that comes off of the manifold, since it sits so close to the manifold, I would not be surprised to find it frail and broken.

If you have tried everything else, have you had the code cleared after you changed out the parts? try having it cleared again....

Posted on Aug 21, 2009

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1 Answer

1998 volvo s70 2.4 glt turbo


code p0102 refers to MAF/VAF sensor ---low input ===causes --wiring short to ground. MAF/VAF sensor
code po172 refers to system too rich --bank 1=== causes ---intake blocked --EVAP canister purge valve---fuel pressure ---HO2S sensor
code po random misfires ---plugs --wiring ---injectors--low compression
code po305 refers to cylinder 5 misfire detected ===causes --engine mechanical fault--ignition/ fuel system ---injector ---ECT/MAF

I would check that the air filter is not blocked first as it affects the MAF/VAF sensors . Have a fuel pressure system pressure test done

Feb 13, 2014 | Volvo S70 Cars & Trucks

1 Answer

2009 pontiac g6 purge valve solenoid


code PO171 fuel trim system lean bank 1 conditions.possible causes air leaks in intake manifold exhaust pipes or exhaust manifold. fuel control sensor is out of calibration such as ECT IAT MAF.fuel component faulty like stopped up fuel filter fuel injectors clogged low fuel pressure faulty fuel pump. HO2S element contaminated or has failed. purge solenoid is part of EVAP system. if you have faulty purge solenoid you would get code like PO443 meaning evaporative emission control system purge control valve circuit malfunction.try replacing fuel filter clean fuel injectors see what happens.

Apr 04, 2013 | 2009 Pontiac G6

1 Answer

2000 nissan frontier rough idle and has a po325,po300,po120,and po304


THROTTLE POSITION SENSOR, MISFIRE, #4 MISFIRE, KNOCK SENSOR, THESE ARE YOUR TROUBLE CODES, PO120,PO300, PO304, PO325, RESPECTIVELY, REPLACE THE TPS @ THROTTLE BODY, REPLACE KNOCK SENSOR , @ ENGINE BLOCK, REPLACE YOUR SPARK PLUGS & PLUG WIRES ! AND YOU MUST ALSO REPLACE BOTH YOUR AIR & FUEL FILTERS, DISTRIBUTOR CAP & ROTOR , INSPECT, MAY NEED TO REPLACE, I WOULD ANYWAY !!!!!!!! ADD SOME GOOD FUEL INJECTOR CLEANER TO TANK, NEXT FUEL UP !

Apr 02, 2013 | Nissan Frontier Cars & Trucks

1 Answer

2003 Ford Expedition check engine light on .Codes PO171 & PO174


This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback

Feb 18, 2013 | 2003 Ford Expedition

1 Answer

2001 nissan sentra code po171


ok the fuel pressure is very good , and you replace maf sensor too,
i think 2 probable throubles, one , the catalyc converter clogged , to check remove exhaust pipe section before catalyc and run engine, its very loudness, other is tps fault, tps is throttle position sensor, located on acceleration body

Jul 30, 2010 | 1996 Nissan Sentra

1 Answer

P134, p0141, po300, po130 and po135. 2005 Sunfire.


Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0300 - Random/Multiple Cylinder Misfire Detected

Jun 16, 2010 | 2005 Pontiac Sunfire

3 Answers

2001 ford focus had the spark plugs and wire change. Has a code po171.. ran good for two days. The spark plugs are blacker than acs of spades which is running rich. Don't know what to do next. To me its...


PO171-System to Lean (Bank 1)

Air filter cover tight?
All intake ducting tight?
Clean MAF Sensor.--CRC MAF Cleaner
Fuel Pressure Regulator?
EVAP Purge Valve-stuck open?
Vacuum leaks?
EGR System-issues?

Seems your getting a lean O2 Code,because it is trying to correct for a rich condition,as you said.

Is the Throttle Position Sensor-original?

Work on what is driving it rich,my list is a possible.

May 19, 2010 | 2001 Ford Focus

1 Answer

I have the po171 code. how can i fix it?


ur o2 sensor is detecting a lean condition bank 1check ur maf sensor may be dirty or replacement try cleaning it with an electronics spray or brake spray cleaner --also check pvc lines and vacuum lines --not often but the fuel filer can also set this code off check fuel pressure

Jan 18, 2010 | 2001 Ford Focus

1 Answer

Getting a code po171 on a '98 ford expedition...O2 sensor? If so whitch one?


CODE PO171 -SYSTEM ADAPTIVE FUEL TOO LEAN. POSSIBLE CAUSE.AIR LEAKS AFTER THE MAF SENSOR OR LEAKS IN THE PVC SYSTEM. EXHAUST LEAKS BEFORE OR NEAR WHERE THE HO2S IS MOUNTED. FUEL INJECTORS RESTRICTED OR NOT SUPPLYING ENOUGH FUEL. FUEL PUMP WEAK. LEAKING EGR VALVE GASKET OR DIAPHRAGM.MAF SENSOR DIRTY CAUSES PCM TO UNDERESTIMATE AIR FLOW / NOW THE BANK 1 SENSOR ITS MOUNTED IN THE EXHAUST SYSTEM BEFORE THE CATALYTIC CONVERTER.THE BANK 2 SENSOR IS IN EXHAUST AFTER THE CATALYTIC CONVERTER.

Aug 27, 2009 | 1998 Ford Expedition

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

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