1998 Nissan Altima, Trouble code P0171, Ongoing problem


Asked by jtakesh Nov 19, 2012 at 08:13 AM about the 1998 Nissan Altima GXE

Question type: Maintenance & Repair

As before the P0171 code keeps popping up, I changed the front Oxygen Sensor, Air Mass Mater, fuel filter & finally found the PCV valve, when I changed the PCV Valve the car ran much better and the code didn't come back up, but after a couple of days the car started running the same, poor rough idle, poor gas milage & and a gas/exhaust smell in the car. Could the PCV valve have clooged up so fast, possibly because of gunk in the line or where the valve plugs into?

3 Answers

Ronald Dopwell

how often do you change your Oil ? is there any Sludge in the Engine ? you may be looking at a lengthy overhaul of your engine internals if there is a Sludge buildup

2 out of 2 people think this is helpful.
Best Answer

There should not be any sludge in the engine, I or my son changes the oil once every 3 months and there is usually not 3,000 miles on it by that time, this engine was replaced about three years age because the timing chain broke and trashed the original engine, the replacement engine was used, about 68,000 miles on it, when installed, the oil was changed @ 1,000 miles then at a maxium of 3,000 there after, can't understand if the engine is sludged up, I'll take the PCV valve out again tonight to see if it'e clogged up, if it is, I guess there's a problem.

Robert Lavallee

look vor vacuum leaks or intake or exhaust leaks. p0171 lean means theres too much oxygen and most likely is pulling air in at the intake manifold gasket or if you're smelling it inside car could be exhaust leak which may be sucking air in there causing the oxygen sensor to read too much oxygen and setting codes. so inspect intake and exhust for leaks.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 1998 nissan altima PO 300 3 answers

    I have a 98 Nissan Altima that has intermittently give me a code PO300. I have replaced the plugs, wires, distributor and cap. Still has the same problem. Don't know where to go from here.

    1998 Nissan Altima GXE


    Maintenance & Repair

  • 1103 trouble code service reminder or problem 1 answer

    about every other month check eng light comes on with code 1103 says to take to dealer

    1998 Nissan Altima XE


    Maintenance & Repair

  • Nissan Altima throws code P 505 1 answer

    98 Altima had total engine rebuilt. Head was warped, machined smoothed, runs great. Now engine light on, throws code P 505 and needs Ca. smog cert. Tech said it will be about $400.00. He let me kn...

    1998 Nissan Altima GXE


    Maintenance & Repair

  • Can run Nissan Altima 2012 without I-Key 2 answers

    Hi, I have a 2012 Nissan Altima 2.5s. If I start the engine normally wit i-key in my pocket, then leave the vehicle running and get out. Then remove my i-key away from the vehicle and enter the agai...

    2012 Nissan Altima 2.5 S


    Maintenance & Repair

Looking for a Used Altima in your area?
CarGurus has 82,472 nationwide Altima listings starting at $950.

Search Nissan Altima Questions

Nissan Altima Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,320
#2 FordNut
Reputation 740
#3 tenspeed
Reputation 450
View All

Related Models For Sale

Used Nissan Maxima"
392 Great Deals out of 23,623 listings starting at $1,500
Used Honda Accord"
934 Great Deals out of 74,550 listings starting at $1,295
Used Toyota Camry"
1,214 Great Deals out of 85,516 listings starting at $999
Used Honda Civic"
833 Great Deals out of 58,101 listings starting at $999
Used Nissan Sentra"
740 Great Deals out of 49,426 listings starting at $1,795
Used Toyota Corolla"
1,116 Great Deals out of 71,852 listings starting at $1,995
Used Hyundai Sonata"
969 Great Deals out of 69,122 listings starting at $1,272
Used Chevrolet Malibu"
1,118 Great Deals out of 56,361 listings starting at $1,400

Used Cars For Sale

2015 Nissan Altima For Sale
169 Great Deals out of 45,988 listings starting at $11,979
2014 Nissan Altima For Sale
222 Great Deals out of 6,223 listings starting at $10,900
2013 Nissan Altima For Sale
270 Great Deals out of 7,113 listings starting at $7,999
2012 Nissan Altima For Sale
191 Great Deals out of 5,179 listings starting at $4,500
2011 Nissan Altima For Sale
50 Great Deals out of 1,653 listings starting at $3,300