Question about 1991 Honda Accord

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Tranny not shifting correct

I put a new exhaust on my car and o2 sensor(did not unhook neg batt cable during this exhaust and o2 swap). The following day I had my car tranny fluid and new muffler installed by Honda dealer. The car drove fine for two weeks but I only live 1.5 miles from my job so keep that in mind. After 2 weeks the tranny started to have trouble shifting from 2nd to 3rd only. It would get to the rpm it would normally shift at and just stay there winding out. I would have to floor the car to get it to eventually shift. 1st to 2nd, 3rd to 4th are ok. I continued to drive the car for 4 more weeks until it got so bad it would do it every time I drove the car. I scheduled an appt with Honda but the night before the appt I checked the tranny fluid and found the level to be just at the low mark. I put 22oz of fluid in so apparently Honda didnt put the correct level of fluid in it when I had it serviced by them and I had drove it this way for a total of 6 weeks after the exhaust o2 swap and tranny fluid change. The Honda dealer found two codes, o2 sensor and throttle position senor, and cleared them. They said the o2 and throttle sensor checked out ok and found nothing wrong with the tranny. I now have the car back and it seems ok for now but what could have caused this problem? Do the o2 sensor and throttle position sensor have anything to do with the shift problem from 2nd to 3rd or could it have been the low tranny fluid and after filling and driving it the fluid was able to get into all the channels with in the tranny?

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The throtle posistion sensor. Sent to the trans. signal.
To shifting correctly, at especific. wide trhottle or open. engine rpm.and speed.

Posted on Jul 04, 2008


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1 Answer

Chevy venture draining battery

The alternator is out. The ONLY time your vehicle uses battery power (while the engine is turning) is during start up. After that the alternator runs the car.

With the car running put a volt meter on the alternator. Red lead on the big nut on back side if alt. Black lead on the neg batt cable or a good body ground. Voltage should be around 14.5v DC.
Then still with engine running, red lead to batt postive, black lead to batt neg. Voltage should read the same. 14.5v DC
If not, the alt. Is bad

Dec 31, 2012 | 2002 Chevrolet Venture Passanger

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Just had both o2 sensors replaced and now the truck won't shift from 2nd to 3rd gear. Evidently it had been slipping a bit before but now it won't shift into 3rd at all. The tranny is an E4OD......

O2 Sensors --- not related to shifting

New transmissions --- are only new once
When installed on the assy line

Has to be rebuilt if necessary

PO 147 ---O2 Sensor Heater (Bank 1 Sensor 3) don't have one of those
PO714 -- Trans Temp Sensor -heat for the slipping
PO 471 --- Exhaust Pressure Sensor -don't have that either

Need a new guy
Not very professional were they

Jun 13, 2011 | 1997 Ford Expedition

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96 Ford Taurus (150K miles) with engine code P0141 heated O2 sensor bank 1 sensor 2. This happened after having the transmission replaced. The engine runs rough or stalls during an idle. The transmission...

the transmission replcement mechanic may have missed plugging the 02 sensor back up,or layed the 02 sensor wires across the exhaust system,which burnt the 02 sensor wires.they also may have missed plugging sensors back up. suggest you go back to replacement mechanic and have them explain to you why it does'nt run the same. but do not be fooled,somethings not plugged back correctly.i know budget living. is check engine light on? if so, auto zone and advance auto parts can diagnose with printout for free. no charge! hope this helps and thank you for choosing us marine retired

Dec 28, 2010 | 2003 Ford Taurus

1 Answer

Where are the four O2 sensors on a 2003 Montero Sport? Is $300 reasonable to replace the two upstream sensors?

According to the service literature I read, the 2003 Montero Sport with the 3.0 or 3.5 L engine does not have O2 sensors listed even in the maintenance schedule. The 2.4 L engine has it on the exhaust manifold though.
However, the following lists the par, though for before or after the catalytic converter:

I think that $250 to $300 is reasonable if the Oxygen sensors are stuck in there with rust and the threads are preserved by the technician. Oxygen Sensor replacement can be tricky.
Good luck on this repair.

Exhaust Manifold


2.4L Engine

  1. Remove or disconnect the following:

    • Negative battery cable

    Wait at least 90 seconds after the negative
    battery cable is disconnected to prevent possible deployment of the air bag.

  2. Heat cowl from the exhaust manifold
  3. Aspirator valve assembly, if equipped
  4. Oil dipstick and guide
  5. Oxygen (O2S) sensor connector and ground cable, if equipped
  6. Exhaust pipe from the manifold
  7. Exhaust manifold and gasket from the engine
    To install:

  8. Install or connect the following:

    • Exhaust manifold. Torque the M8 mounting nuts to 22 ft. lbs. (29 Nm) and the
      M10 mounting bolts 36 ft. lbs. (49 Nm). starting from the middle and working
    • O2S sensor connector and ground cable, if equipped
    • Exhaust pipe to the manifold. Torque the nuts to 35ft. (49 Nm).
    • Aspirator valve assembly, if removed
    • Heat cowl to the exhaust manifold. Torque the bolts to 117 inch lbs. (13
    • Negative battery cable

  9. Start the engine and check for exhaust leaks.

3.0L and 3.5L Engines

  1. Remove or disconnect the following:

    • Negative battery cable
    • Exhaust pipe from the exhaust manifolds
    • Oil dipstick, guide and O-ring
    • Heat shields
    • Exhaust manifolds

  2. Clean the gasket mounting surfaces. Inspect the manifolds for cracks,
    flatness and/or damage.
    To install:

  3. Install or connect the following:

    • New gasket and exhaust manifold. Torque the nuts to 33 ft. lbs. (44 Nm) on
      3.0L engines and 22 ft. lbs. (29 Nm) on 3.5L engines.
    • Heat shield, Torque the bolts to 10 ft. lbs. (14 Nm).
    • Exhaust pipe to the exhaust manifolds. Torque the nuts to 35ft. (49 Nm).
    • Oil dipstick, guide and new O-ring
    • Negative battery cable

  4. Start the engine and check for exhaust leaks.

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Oct 07, 2010 | 2003 Mitsubishi Montero Sport

1 Answer

I have a 2000 GMC sierra 2500 truck. The guy I bought it from had a new transmition put in it. After driving a while I noticed that the tranny wouldn't shift into low gears 1st & 2nd on comand. and...

-----check possible tps [throttle position sensor ]circuit for damage or faulty sensor----if good check the fuses and trans harness for shorts damage or disconnection,check o2 sensors wiring possible ground to exhaust ,or internal leak 2nd gear apply circuit[servo assembly or 1-2 accumulator] or poor pump pressure

Feb 13, 2010 | 2000 GMC Sierra

1 Answer

Runs fine until it hits temperature then misfires?

o2 sensors are swapped by mistake! make sure the correct wires are plugged into the corresponding sensors. did you have exhaust or other o2 sensor work done? possibly a failing catalytic converter but unlikely. Check engine light?

Nov 30, 2009 | 1999 BMW 323 Series

2 Answers

96 Dodge Neon O2 sensor Ckt No Activity bank 1 sensor 1----how do I replace the sensor, will that correct a problem with the check engine light?

That would correct the problem, the O2 sensor is on the exhaust manifold or on the exhaust manifold down pipe. If you go to Auto Zone, they will have the O2 sensor you need and also the loaner tool you may need to remove the O2 sensor. Auto Zone also can give you the step by step instructions to replacing the O2 sensor in about 30 min. Once you located the O2 sensor, disconnect the wire harness and use the O2 sensor socket to remove the sensor from the exhaust. It's like removing a spark plug, to install the new O2 sensor is just to follow the same procedure in revers to the removal. Good luck.

Oct 28, 2009 | 1996 Dodge Neon

1 Answer

How do you replace the oxygen sensors in a 2001 nissan altima?

  1. Start the engine and allow it to reach normal operating temperature, then turn the ignition switch OFF.
  2. Disconnect the negative battery cable.
  3. Open the hood and locate the Oxygen (O2S) sensor connector. It may be necessary to raise and safely support the vehicle for access to the sensor and its connector. NOTE: On a few models, it may be necessary to remove the passenger seat and lift the carpeting in order to access the connector for a downstream O2S sensor.
  4. Disengage the O2S sensor pigtail connector from the vehicle harness connector. NOTE: There are generally 2 methods used to mount an O2S sensor in the exhaust system: either the O2S sensor is threaded directly into the exhaust component (screw-in type) or the O2S sensor is retained by a flange and 2 nuts or bolts (flange type). WARNING
    To prevent damaging a screw-in type O2S sensor, if excessive force is needed to remove the sensor lubricate it with penetrating oil prior to removal. Also, be sure to protect the tip of the sensor. O2S sensor tips are very sensitive and may be easily damaged if allowed to strike or come in contact with other objects.
  5. Remove the sensor, as follows:
    • Screw-in type sensors — O2S sensors are usually designed with a permanently attached wiring pigtail. This allows the wiring harness and sensor connectors to be positioned away from the hot exhaust system. It may be necessary to use a socket or wrench that is designed specifically for this purpose. Before purchasing such a socket, be sure that you can't save some money by using a box end wrench for sensor removal.
    • Flange type sensors — Loosen the hold-down nuts or bolts and pull the sensor out of the exhaust component. Be sure to remove and discard the old sensor gasket, if equipped. You will need a new gasket for installation.
  6. Perform a visual inspection of the sensor. Black sooty deposits may indicate a rich air/fuel mixture, brown deposits may indicate an oil consumption problem, and white gritty deposits may indicate an internal coolant leak. All of these conditions can destroy a new sensor if not corrected before installation. To install:
  7. Install the sensor, as follows: NOTE: A special anti-seize compound is used on most screw-in type O2S sensor threads, and is designed to ease O2S sensor removal. New sensors usually have the compound already applied to the threads. However, if installing the old O2S sensor or the new sensor did not come with compound, apply a thin coating of electrically-conductive anti-seize compound to the sensor threads. WARNING
    Be sure to prevent any of the anti-seize compound from coming in contact with the O2S sensor tip. Also, take precautions to protect the sensor tip from physical damage during installation.
    • Screw-in type sensors — Install the sensor in the mounting boss, then tighten it securely.
    • Flange type sensors — Position a new sensor gasket on the exhaust component and insert the sensor. Tighten the hold-down fasteners securely and evenly.
  8. Reattach the sensor pigtail connector to the vehicle harness connector.
  9. Lower the vehicle.
  10. Connect the negative battery cable.
  11. Start the engine and ensure no Diagnostic Trouble Codes (DTC's) are set.

Fig. 1: Since sensor locations vary between vehicles, the first step in removal is to locate the O2S sensors (arrows)...

    Fig. 2: ... and the sensor connector (2), which is usually near the O2S sensor (1), but removed enough from the heat of the exhaust system
    Fig. 3: Disengage the sensor pigtail connector half from the vehicle harness connector half

Oct 01, 2009 | 2001 Nissan Altima

1 Answer

Check engine code p0700

this code is a transmission code and has a few different tranny sensors that is reads. you could just be low on tranny fluid or is could be the tranny axle speed sensor. odds are if its running fine now it is just low fluid but you could look into the sensor after that. the sensor is what tells the truck when to shift so thats could be why it went up in rpms if the sensor went out bacause then it would know exactly how to shift.

Mar 31, 2009 | 2001 Dodge Dakota

2 Answers

Cavalier o2 sensor

The 02 sensor is screwed into the exhaust pipe, unhook the wire connection, the best thing to use is an 02 sensor socket, and unscrew the sensor. You can use a wrench, but some of them can be stubborn. There are different size sockets, so have the guy in the auto parts store match the new sensor with the right socket.

Jan 28, 2009 | 2004 Chevrolet Cavalier

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