Question about 2004 Cadillac SRX

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PO174 AND PO171\

I AM AT THE END OF MY LIST WITH THIS...CAN YOU HELP..ANY IDEAS....I HAVE RELACED UPSTREAM 02 SENSORS CATALYTIC CONVERTER, FUEL FILTER, SPARK PLUGS, COIL PACKS, INTAKE GASKETS, HAVE DONE AN INJECTOR SERVICE, FUEL PRESSURE MAINTAINS 58 TO 60 PSI, PERFORMED SMOKE TEST ON ENTIRE SYSTEM FOUND NO LEAKS, SPRAYED COMON AREAS WITH BRAKE CLEAN, ADDED PROPANE GAS THRU INTAKE BEHIND MAF SENSOR TO TRY AND RICHEN THE SENSORS ......CHECKED ALL WIRING TO AND FROM FRONT O2 SENORS, AND MY READINGS ON THE O2 SENSOR REMAIN TO BE STUC AT 36 TO 40 AND THE LADA READINGS ARE STUCK AT .002......ANY IDEAS WOULD BE APPRECIATED.........THANK YOU CHRIS

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  • Cadillac Master
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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

Posted on Apr 11, 2017

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6ya6ya
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Posted on Jan 02, 2017

alicantecoli
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SOURCE: what would cause the car to run fine at idle but

it sounds like the mass air flow metering sensor thats in the air intake pipe ,but any more than that iam at a loss as none of these cars here in spain so i cannot tell you exactly where to look

Posted on Jun 15, 2010

emissionwiz
  • 75797 Answers

SOURCE: Check Engine Light. I have a 03 escalade that

Your fuel pressure is WAY to low, it should be at least 55 PSI, (spec is 55-62 PSI) You will need to replace the fuel pump and the fuel filter then clear the codes and retest, the fuel pump is located inside the fuel tank, the fuel tank must be removed to access the pump. after the fuel pump is replaced if any lean codes come back from the O2 sensors the intake maniold gaskets will need to be replaced as well, they are a common problem as well but your main problem is very low fuel pressure, this alone will set all the codes you have.

Posted on Oct 28, 2010

canwoodjc
  • 3301 Answers

SOURCE: Will a bad catalytic converter

you have numerous problems to address, the cat could cause the car to smoke, but only because something is getting in it, heating up , and causing the smoke, normally if its white its due to water, and blue or gray due to a fuel issue , as far as a head gasket, if it was bad your cat could be bad too, so could the MAF sensor,, the alternator could work into this mess just due to the sensors not providing the correct signals to be sent to the computer in the car ,, but I doubt its bad , it can be simply checked, if you have a known good battery ,, use a meter and place the leads on the battery terminals, you should see a reading of between 13.5 and 14.5 volts, ( with the car running) if you do the alt is good, if not,, its probably bad,, There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.

Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0-5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.

When a MAF is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

Posted on Sep 20, 2011

saailer
  • 1868 Answers

SOURCE: I have a 1991 Cadillac Deville with a V8. It won't pass smog. Has high co. I replaced the egr valve, charcoal canister, spark plugs, spark plug wires, cap and rotor, catalytic converter, oxygen sen

Hello! when you say you checked the MAP sensor what do you mean? Did you take voltage readings at idle ? A vacuum leak is the likely culprit, especially to the MAP...The minor shake at idle being the major clue...Send a comment...guru..saailer

Posted on Dec 24, 2011

SOURCE: my 2001 cadillac catera es running rich

Hi Armindo, Check and clean the mass air flow sensor and then check the intake manifold for any leakage of air. Check vacuum hoses for cracks, loose fitting or damaged connections. Also check the manifold for leakage. Regards John

Posted on Oct 20, 2012

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I have a 2002 chevy impala I changed the 02 sensor and my check engine light is still on and reading the same 02 sensor


You should have a primary and secondary O2 sensor, upstream and downstream. Pre-Catalytic converter and Post-Catalytic converter.
Which one did you replace?

Mar 18, 2015 | 2002 Chevrolet Impala

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How many 02 sensors does a 2001 Cadillac deville have


4 total. 1 each manifold. Then 1 before, 1 after the CAT. You should be able to count and trace them from the connections on the top of your engine. Good luck

Feb 23, 2015 | Cadillac DeVille Cars & Trucks

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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

2003 Ford Expedition check engine codes PO171 & PO174


You should be replacing all upstream oxygen sensors,
the ones at the inlet or pipe before the converter,on all
your vehicles at 100,000 miles

Go to Rock Auto.Com & buy two & install yourself

NTK 22060 $26.79 ea

Feb 18, 2013 | 2003 Ford Expedition

1 Answer

I have 2001 Suzuki Vitara, just recently was having problems with car cutting off or put putting, so I took to a mechanic we replace fuel filter, check engine light was staying on he pur computer on it I...


Relaced all that and didn't check the catalitic converter. When you get codes for MAF sensor and 02 Sensors, the first place to check is vacuum leaks, if none are found then it would go right to the catalitic converter. You might want to consider another mechanic.

May 15, 2011 | 2000 Suzuki Grand Vitara

1 Answer

P0133 error code what 02 sensor is it


This involves the front oxygen sensor on bank 1 sensor 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use. --------- There are two 02 sensors.That are before and after catalytic converter. Bank 1 sensor 1 (upstream/precatalytic converter) and bank 1 sensor 2 (downstream/post catalytic converter).
------------
But if possible replace both.The bank 1 as well as bank 2. Replacing both at a time is always advisable.--------- This should help.Thanks.Helpmech.

Mar 01, 2011 | 2001 Honda Prelude

1 Answer

P1131,p1151,p0174


Hello,
P1131 = Lack of HO2S11 switch - sensor indicates lean, ( upstream heated oxygen sensor )
This oxygen sensor is located before the catalytic converter, ( refered to as UPSTREAM )

P1151 = Lack of HO2S21 switch - sensor indicates lean, ( could be up, or downstream heated oxygen sensor ) " Downstream ", meaning after the catalytic converter.

PO174 = System too lean, ( bank 2 ) The fuel/air mix ratio is bad.

These DCT codes are generally caused by a problem with the emissions system. The following items are a few of the most common items to trigger those codes.

1. Dirty air filter. ( very common )
2. Faulty idle air control valve. ( common )
3. MAF, ( mass air flow ), sensor. ( very common )

All 3 of the above can prevent the onboard computer from determining the proper fuel/air mix ratio.
The oxygen sensors measure to insure the fuel/air mix produces maximum power with minimal emissions.

I hope this helps you.
Feel free to contact me in the comment section if you have a question.

Feb 15, 2011 | 2002 Ford F150 Regular Cab

3 Answers

Code po430 not sure what maybe converter


One of three (3) possibitlies:
1. Catalytic Converter is malfunctioning.
2. O2 Sensor is malfunctioning. This will be the O2 Sensor located on the Catalytic Converter. However you should check and/or replace both sensors if needed.
3. You have an Exhaust Leak.
In Order of checking:
A. Check and Repair any Exhaust Leak.
B. Replace the O2 Sensor on the Catalytic Converter 1st. Also Known as the Downstream O2 Sensor or HO2 Sensor.
C. Replace the O2 on the Exhaust Manifold prior to the Catalytic Converter. Also Known as the Upstream O2 Sensor.
D. Replace the Catalytic Converter.
Let me know if this helped, or if you have any additional information, problems or questions. Feel free to contact me at FixYa.com!

Feb 01, 2010 | 1998 Ford Explorer

1 Answer

Where is the 02 sensor on the catalytic converter on the 1998 honda accord lx v6


there are more than one. O2 sensors upstream are located in the piping before the catalytic, possibly on the exhaust manifold. these control fuel trims (mixture).

then there is one after the catalytic which is only used to moitor the converter (make sure it's working properly)

Jun 25, 2009 | 1998 Honda Accord

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