Question about 1997 Honda Accord

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Car will not start

After replacing two O2 sensors and the mapping sensor the vehicle will not start. The vehicle was running before replacing the sensors and the computer analysis indicated that the sensors were faulty and should be replaced

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Why did you replace the MAP sensor? .....put the old one back and see if it starts. Also depending on the yr this could take air fuel sensors NOT O2 sensors fo a few yrs the connectors were interchangeable. Must have the right sensors...look at the emissions lable for clarification. Must also have vacuum line on the MAP sensor

Posted on Nov 20, 2008

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Do you get the crack when you start the car.if not then check the ignition switch.

Posted on Nov 20, 2008

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  • smarttech Nov 20, 2008

    if the ignition switch is proper then check whole ignition module.

  • smarttech Nov 20, 2008

    Check
    all of the battery terminals and cables and check the wires on the
    starter/selonoid, start from the battery and follow the cable out and check all
    conections , clean and tighten them and if it still does it the
    starter/selonoid is bad and needs replacement...



     



  • smarttech Nov 20, 2008

    also check out the idle valve.

  • smarttech Nov 20, 2008

    or
    Defective new sensors, shorted wire, defective computer .check out this.

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1 Answer

I got a P0601 DTC on my 2001 Chrysler Voyager 2.4. I replaced the PCM and immediately got a P0172 with a rough idle. I replaced the O2 sensors but still have the same problem with same DTCs.


OK. Let's see here...with the code P0601 you had no choice but to replace the PCM. Now here is the kicker...Was it properly programmed before you started the engine up? I just have to ask because I have seen things like this happen with PCM replacements when the PCM did not get programmed properly or when people switch out used PCM's from other vehicles that are not programmed with the correct software for the vehicle it is going into.

Now, with all that said:
P0172-1/1 FUEL SYSTEM RICH
The O2 sensors are RARELY - IF EVER the cause of this code. It does not surprise me that replacing the O2 sensors did not fix it.

Either the O2 sensor signal circuit is shorted to voltage, or you have something wrong with your engine that is causing the engine to run extremely rich. Any way you look at it, your O2 sensor signal voltage is way too high. This is why O2 sensor failures do not usually cause this code. When O2 sensors fail, they do not produce voltage like they should and you will get LEAN codes, not RICH codes.

Anyway, this code is more likely to be caused by a bad engine coolant temperature sensor (ECT), a bad manifold absolute pressure sensor (MAP), a leaking fuel pressure regulator diaphragm, leaking injectors, etc. or something could be shorting out the reference voltage to the MAP sensor and the Throttle Position Sensor.

Please also review this article:

What Else Could Be Wrong?

Sep 20, 2011 | Chrysler Voyager Cars & Trucks

1 Answer

Symptons o2 sensors


If your O2 sensors are malfunctioning, the main symptom would be that the Check Engine light will come on. On some vehicles, an O2 sensor circuit shorted to ground can cause a no-start problem.
If the "Check Engine" or "Service Engine Soon" light is on and there is a code for the O2 sensors, I would like to also advise you that many O2 sensor codes are not caused by the O2 sensors themselves. In many cases, the O2 sensors are only REPORTING the problem. for example, a code P0171 "Oxygen Sensor Lean" code is rarely ever caused by the O2 sensor. It is usually caused by a vacuum leak or a failed Mass Airflow sensor (MAF) or Manifold Absolute Pressure sensor (MAP) or a bad fuel injector. In these cases, repairing the real reason that the engine is running lean will fix the O2 Sensor code without replacing the O2 sensor.

Mar 12, 2011 | 2000 Chevrolet 3500

1 Answer

Engine light came on. checked for codes, 1129 appeared. can't find the code anywhere. prior to this code, replaced O2 sensor and transmisson was rebuilt . trans was done first and then code 300 came up....



Jeep code 1129:



Possible Causes

  • RESTRICTED FUEL SUPPLY LINE
  • FUEL PUMP INLET STRAINER PLUGGED
  • FUEL PUMP MODULE
  • O2 SIGNAL CIRCUIT
  • O2 RETURN CIRCUIT
  • O2 SENSOR HEATER OPERATION
  • O2 SENSOR
  • MAP SENSOR OPERATION
  • ECT SENSOR OPERATION
  • ENGINE MECHANICAL PROBLEM
  • FUEL FILTER/PRESSURE REGULATOR (HIGH)
  • PCM

Mar 02, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

2003 taheo cold starts runs rough and stalls. once warmed up runs good. O2 sensors changed along with map sensor.


consider replacing the idle control sensor. the part costs around $20.00 and easy to replace.remove 2 screws and unplug it. install new one,disconnect your positive cable on the battery for 10minutes to allow your computer to introduce the new sensor into it.after the 10 minutes is up reconnect your battery and the vehicle should run fine again. thank you for choosing fixya.com and let me know if this repairs your problem.

Jan 23, 2011 | 2003 Chevrolet Tahoe

1 Answer

Vehicle has poor idle and dies. Only codes are for oxygen sensor short. Data stream is normal except for o2 sensors not switching and when symptom occurs map sensor reads low and vacuum is low but that is...


This is very clear, replace the o2 sensor that so important to the fuel mixture and idle and etc, you first need to replace that o2, then reset the codes and run it, if that sensor is shorting and killing the 5 volt ref signal to other sensors or computer it will run like sh***t, start there that may be your only problem, depending on how long that sensors been bad you may have cat converter damage, but thats next, hope this helps.

Sep 09, 2010 | 1997 Plymouth Breeze

2 Answers

91 chevy 4.3 v-6 runs extremely rich when engine is cold gives codes 13, 33 and 54 I know what these codes are but I need to know is could the computer coolant temp sensor or the air cleaner temp sensor...


DTC - 13 Oxygen sensor circuit open or no activity
DTC - 33 MAP sensor circuit error (signal high indicating low vacuum)
DTC - 54 Fuel pump circuit low voltage

Start with checking the wire leads to the O2 sensors and MAP sensor. Look for any damages to the wire harness and replace any parts damaged or faulty.

The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".

Jan 10, 2010 | 1991 Chevrolet S-10

2 Answers

Code of P0172 vehicle is running too rich repalced


of course you have a faulty sensor somewhere. i would suspect a O2 sensor. good luck. the manual(haynes) doesnt go into detail what to check for that code.

Nov 25, 2008 | 1996 Lincoln Town Car

1 Answer

1)it will not go over 3500 rpm (2)when it first starts it runs a little better for a minute or so and then back to not idling (3)the codes said bad MAP sensor, bad O2 sensor (up stream)and problem in the...


I'd lean toward the MAP/MAF sensor because of the rev limit. A car with a bad O2 sensor will still rev to redline - it'll just be running rich the whole time. Some manufacturers put in a rev limiter that kicks in if the MAP/MAF sensor goes bad, so I'd lean that way first. Clean the electrical connector with contact cleaner, and run a half a can of Seafoam through the vacuum system - this may clear up your issues. If not, I'd replace the MAP/MAF sensor before the O2 sensor.

Sep 15, 2008 | Honda Civic Cars & Trucks

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