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1997 cadillac eldorado fault codes P0131 also p0171, p0174 and po303 smog check fails

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 625 Answers

SOURCE: check engine light codes, p0171,

this fords have very comun problems with maf sensors geting contaminated, if you have not or can hear any vacium leaks, the problem is goin to be a conataminated mas air flow snsor (maf)
allow the engine to cold down for at least 15minutes and the remove the air filter hosing and inside has to have a sensor, clean the two liitle resistors inside with brake or carburetor cleaner, allow it to dry and reinstall it.
if this inf help please mark it as fixya ranking after you try what i said

Posted on Jun 30, 2008

  • 1861 Answers

SOURCE: Vacuum leak-P0171 2000 Toyota Echo. Need vacuum diagram

A P0171 code does not indicate a vacuum leak; it indicates a dirty mass air flow sensor. This device is located between the air filter box and the intake manifold. Locate it, unplug the wire harness, and remove the 2 screws that holds it onto the intake pipe. Look down inside th sensor, you will see 2 small wires, that are probably covered with fuzzy things...using a spray cleaner, such as brake cleaner, spray the 2 wires until they are clean and shiny. Do NOT use compressed air, that will damage the sensor. When it is clean; reinstall it and drive it. The computer will recognize the now clean sensor, and your troubles will be over.

Posted on May 19, 2009

bschilz
  • 2049 Answers

SOURCE: p0171 and p0174 codes

P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)

If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.

Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.

Posted on Sep 10, 2009

  • 6 Answers

SOURCE: codes p171 and p0174 on a chevy truck?

Subject: 97-05 Vehicles with 4.8 5.3 5.7 and 6.0 Gen III V8 Engines and Misfires on One Bank - kw CEL diagnostics driveability DTC P0171 P0172 P0174 P0175 P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 #PIP3056 - (07/12/2004)

Models: (00-05 Cadillac Escalade - C6 and K6) and (02-05 Chevrolet Avalanche - C1, C2 K1 and K2) and (99-05 Chevrolet Silverado - C1, C2 K1 and K2) and (00-05 Chevrolet Suburban - C1, C2, K1 and K2) and (00-05 Chevrolet Tahoe - C1 and K1) and (99-05 GMC Sierra C1, C2 K1 and K2) and (00-05 GMC Yukon - C1, C2, K1 and K2) and (03-05 Chevrolet Express G1, G2, G3, H1, H2 ) and (03-05 GMC Savana G1, G2, G3, H1, H2 ) and (04-05 Buick Rainier S1, T1 ) and (03-05 Chevrolet Trail Blazer EXT S1, T1 ) and (03-05 GMC Envoy XL XUV S1, T1 ) and (03-05 Hummer H2) and (04-05 Cadillac CTS-V DB) and (98-02 Chevrolet Camaro FB) and (97-04 Chevrolet Corvette YB) and (98-02 Pontiac Firebird FB) and (04-05 Pontiac GTO VB)

The following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
Check Engine Light with a P0300 due to 2 - 4 cylinders misfiring on the same bank of the engine. DTCs P0171, P0172, P0174 or P0175 may also set for the misfiring bank.

Recommendation/Instructions:
If the published misfire diagnostic does not isolate the cause, perform the following suggestions as necessary:

  • Perform a fuel injector balance test for all 8 cylinders. If a fuel injector concern exists, it is possible to misfuel an entire bank of the engine, causing multiple cylinders on the same bank to misfire even though the root cause is a single fuel injector.
  • Inspect O2 sensor connections on the misfiring bank for corrosion or water intrusion. If water intrusion is found on the right bank, it may be due to the AC Evaporator Condensation dripping onto the O2 sensor harness. If this condition is found, reposition and shield the harness to prevent a repeat concern and repair the connections.
  • Check for excessive exhaust backpressure using the restricted exhaust diagnosis.
  • Swap the Position 1 O2 sensors side to side to see if the misfires move to the other bank of the engine. If so, replace the O2 sensor.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

NOTE: GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition.

Posted on Sep 30, 2009

Shorty1_wt
  • 324 Answers

SOURCE: My cadillac deville has the following engine codes

click on the below links for code details.
P0106

P0121

P0171

P0174


P0335


P0340

P0385

P0442

P0506

P0507

P0601.

all of the above codes seem to have a common cause, they all list a bad ecm (computer) as being a cause, and the last code P0601 points specifically to a bad computer. sorry for the bad news, hope this helps.

Posted on Jan 28, 2010

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Codes po303, po171, po137. po420


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1 Answer

P0171 & P0174 1997 Deville


Lean bank 1and bank 2, possible vacuum leak , restricted fuel filter or low fuel pressure.

Dec 27, 2013 | 1997 Cadillac DeVille

1 Answer

What are the probable causes of DTCs P0171, P0174, and P0455?


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1 Answer

How to fix codes P0171 & P0174


Determining exactly what of the thousands of parts on a modern car is broken is as difficult as doing the repairs many times. IN this video you'll learn how to diagnose and fix error codes P0171 and P0174 on a 2001 Ford Escape, which indicate vacuum problems.http://www.lightdeal.co.uk/

May 17, 2013 | 1997 Cadillac DeVille

1 Answer

2004 Cadillac DTS engine codes P0171 & P0174


thier is a 1inch round rubber connector between the plentum and the throttle body it has a big round clamp on it start the car and spray starting fluid around that rubber and i gurantee you your engine rav up that mean thier is a crack in that hose it is easy to replace cadillac are famous for that hose to crack and make your cadillac run like ****

Sep 14, 2012 | Cars & Trucks

1 Answer

I took my cadillac catera for an emissions test and it failed. They said it failed due to these to codes: P0171 and P0174. What do the codes mean?


Diagnostic Test Code (DTC) P0171 and P0174 are both "LEAN OXYGEN SENSOR" codes. One is for one side of the engine and the other is for the other side of the engine.

To put it simply, you have too much oxygen in your exhaust on BOTH sides of the engine at the same time.
This can be caused by a number of things including vacuum leaks, low fuel pressure, or a bad Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor.
This should be diagnosed using a scan tool that can read fuel trim data so that an effective repair can be made and verified.

Please note that it is HIGHLY UNLIKELY that these codes are being caused by the oxygen sensors themselves.

Please also review this article:
What Else Could Be Wrong?

Aug 25, 2011 | 2001 Cadillac Catera

1 Answer

My cadillac deville has the following engine codes when hooed up: P0106, P0121, P0171, P0174, P0335, P0340, P0385, P0442, P0506, P0506, P0507, P0601.


click on the below links for code details.
P0106

P0121

P0171

P0174


P0335


P0340

P0385

P0442

P0506

P0507

P0601.

all of the above codes seem to have a common cause, they all list a bad ecm (computer) as being a cause, and the last code P0601 points specifically to a bad computer. sorry for the bad news, hope this helps.

Dec 06, 2009 | 2000 Cadillac DeVille

1 Answer

Can't find cause of p0171/p0174 error on my TJ


Please read thoroughly the explanation of these fault codes and the possible sources of the code at the links provided. But based on the fault codes I think you have a engine vacuum leak.

P0171 Jeep Fuel System 1 1 Lean


P0174 Jeep Fuel System 2 1 Lean

Jul 05, 2017 | 1997 Jeep Tj

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