Question about 1999 Chevrolet S-10 Pickup

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I have codes po171, po174, po303,and p1509 showing up on my 99 chevy s-10. What could be the problem

Replaced fuel spider assembly, MAF sensor, all o2 sensors, plugs, cap and rotor, drained fuel and replaced. Truck has a new engine. May have a small exhaust leak around header pipe. Truck runs ok until it goes into closed loop.

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  • Chevrolet Master
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Google your codes

Posted on Nov 08, 2014

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SOURCE: I keep getting code p0420. I replaced 2 cats, all

are you running regular gas or not you should be running special unleaded fuel

Posted on Jul 01, 2009

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SOURCE: 2006 jeep wrangler code po174

Check wiring to sensors.

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johnjnail
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SOURCE: 91 chevy 2500 4x4 5.7 auto runs fine cold but when

when the engine starts the O2 sensor volts should be around .5 volts or 500mv so the 450mv is correct now i don't know wither your next statement is 115mv of 1150 mv it makes a big difference, so get back with me and i will see what i can do for you.

Posted on Apr 24, 2011

Mr BrokRench
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SOURCE: PO171 and PO174 system to

Dirty fuel injectors.

Posted on Aug 01, 2011

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2 Answers

I have several codes in my 99 Chevy S-10, po171, po174, po303, p1509. could there bo a common problem/


They are related mostly. All have to do with air intake. 170 codes are both sides running lean, to much air. 303 is a #3 misfire, could be a vacuum leak around the plenum. you replaced the spider. Could be the injector not seated right(smell for gas in the oil/dipstick), also could be a bad wire or spark plug. 1509 is an electrical problem with the idle air control motor. Check the plug for corrosion. Also wires usually break a round the plug. This also could be the problems with too much air.

Nov 08, 2014 | Cars & Trucks

1 Answer

PO174 AND PO171\


code p 0171 refers to system too lean bank1===causes ---intake /exhaust leaks--AIR system---MAF/VAF sensors --fuel pressure/pump--injector/S=== HO2S
code p 0174 refers to system too lean bank 2====causes intake /exhaust leak---fuel pressure/pump---injector/s---AIR system---hose connection/s
the fuel pressure is adequate
The HO2S is the heated oxygen sensor in the exhaust manifold /pipe before the cat converter
( is responsible for the fuel ratio settings )
you may have to pull the injectors to have them cleaned and tested
the maf/vaf sensor may have to be replaced as well

Apr 11, 2017 | 2004 Cadillac SRX

1 Answer

I HAVE CODES PO171 AND PO174 04 CADILLAC SRX 4.6L


please go to : repairpal.com/obd-II-code-po171-and-PO174 FOR MORE INFO, good-day!

Apr 17, 2014 | 2004 Cadillac SRX

1 Answer

I have a 2000 Cadillac Deville with 180k miles. I've been getting P0171 and a P0174 code. Yet there is no vacuum leaks. I replaced the MAF and still its idles rough once it heats up. Any suggestions?


Have you not Googled the Codes PO171 & PO174
to learn the problem ?

I would suspect you never changed the front O2 Sensors
at 100,000 miles & they both have now failed

The MAF shouldn't have been the issue

You may also have converters that are worn out
with a 14 year old vehicle

Are you changing Spark Plugs every 3 years ?

A rich fuel issue will drive the O2 lean also
Need to look at Fuel Trim on scan tool & other data

Aug 22, 2013 | Cadillac DeVille 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

Po171 po174 restricted performance


Common fault is leaking gasket on intake manifold towards the back, do you have the following symptoms - uneven idle - sudden cut out on idle but starts up again with no problem?
If so you will find a leak on the inlet manifold. The codes show a leak after the MAF- so this is the area to check. Hope this helps.

May 29, 2012 | 2003 Jaguar S-Type

2 Answers

2002 Chevy Van with a 3400 code po171 too lean how to fix


Code PO171- Lean mix of Bank 1.
Code PO174- Lean mix of Bank 2.

Most of the time a P0171 and P0174 is caused by either a vacuum leak--more than likely the PCV hose and valve or a dirty or defective Mass Airflow (MAF)sensor. Low fuel pressure can also cause this condition. The PCV hose is located on bank one but can affect both sides because the other end is located on the back of the upper intake manifold. Usually they deteriorate and get a hole in it.

Clean the the MAF sensor with MAF cleaner, which you can pick up at any Auto parts store and also pick up a bottle of fuel injector cleaner. Good luck and hope this helps.

Nov 16, 2009 | 2002 Chevrolet Venture Passanger

1 Answer

2006 jeep wrangler code po174


Check wiring to sensors.

Jul 13, 2009 | 2006 Jeep Wrangler

2 Answers

1995 Ford Windstar LX 3.5L Error Codes?


  1. P0171-bank 1 lean, usually oxygen sensor
  2. P0174-bank 2 lean, usually oxygen sensor
  3. PO402-EGR ins. flow, Clean EGR exhaust tubes and replace sensor should fix this problem

Dec 31, 2008 | 1995 Ford Windstar

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