I have a 1996 GMC truck that has a p0154 code

Question:

I have a 1996 GMC 350 truck that has a p0154 code replace the o2 sensor.It was bank 2 sensor 1 replace. The code came up the same what could it be?

Answer:

The computer is not seeing any action from the drivers side front oxygen sensor. Either you changed the wrong sensor or the wire from the sensor to the computer is damaged somewhere.

1991 corsica throttle position sensor

I was told this sensor is bad. Would it make the car stall and not start? But start 10 min. later? Cad doesn't want to speed up very well at all. Any ideas?





Response:

Could be. Any Codes? It could also be any number of other things or a combonation of things including a plugged Cat Converter. Without Codes your guessing. Heres how to get the codes: http://www.freeautomechanic.com/diagnostictroblecodes5.html

 

REPLACED MY BATTERY ON MY 2004 F150, NOW I GET SERVICE ENGINE SOON

Question:
I JUST REPLACED MY BATTERY ON MY 2004 F150,4.6 LITER NOW MY TRUCK IDLES REALLY LOW,I HAVE DRIVEN THE TRUCK ABOUT 60 MILES SINCE I CHANGE BATTERIES NOW I GET SERVICE ENGINE SOON DISPLAY TODAY THE LIGHT JUST CAME ON BUT THE LOW IDLE WAS FROM THE BEGINNIG OF THE BATTERY CHANGE

Answer:
IN ORDER FOR THE LIGHT TO COME ON AND SET A CODE, THE ISSUE HAS TO THERE FOR A CERTAIN LEGTH OF TIME. FOR EXAMPLE A MISFIRE MAY OCCUR BUT UNTILL IT OCCURS 100 TIMES DURING 400 CYCLES IT WILL NOT SET A CODE.

The first thing to do would be to extract the check engine light codes. This can be done with a Scan Tool or you can take it to an Autozone and they will do it for free. Once you have the code it will help guide to the problem area.


Trouble Code Descriptions

last night the "check engine" light came on

QUESTION:

I have a 1998 Honda Civic EX and just recently had a yearly maintenance in July 2008. Just last night the "check engine" light came on. What can be the problem with my Honda? What signs can I look for? Where do I start for troubleshooting since I don't have the manual?

ANSWER:

An error has been detected by the engine management system and you need a computer scan done to find out what is causing the check engine light illuminate.

You can get it done for free at your local Autozone or you can purchase a scan tool and do it yourself.

How to check trouble codes on a 92 la sabre without the scanner

Checker and autozone type places will pull the codes for you for free most the time. Because they will sell you the part to fix it right there too.

If you want to do it yourself, no problem. Follow these steps : EXTRACT GM TROUBLE CODES

You will find step by step procedures for extracting the codes yourself along with code descriptions and causes for each code.

EXAMPLE:
CODE 24
Trouble Code 24 indicates that the Vehicle Speed Sensor (VSS) is reporting an abnormally low reading when other sensors indicate it should be higher.

The conditions for setting this code are:
1) no Code 33 or 34 (MAF Error) is present, and
2) the vehicle speed signal indicates < 4 MPH and
3) engine speed is between 1400 and 4400 RPM, and
4) during a low load condition (LV8 between 50 and 99), and
5) transmission not in Park or Neutral, and
6) all conditions met for more than 20 seconds

If the code was logged when the vehicle was in motion, the following should be checked:
1) Defective or corroded VSS connections
2) Maladjusted TPS sensor. The TPS should read about 0.42 volts at closed throttle
3) Defective speedometer cable
4) Bad or missing speedo drive gear(s) in tail shaft housing of the transmission
5) Defective VSS
6) Defective ECM

What does it mean when the TPMS light on my 2006 Pilot comes on?

QUESTON:
What does it mean when the TPMS light on my 2006 Honda Pilot comes on? I know this means that the system has been deactivated, but what are the possible causes and can I ignore this or is there a way to resolve this without having to spend too much money?

ANSWER:
The first thing you should do is check the air pressure in the tires. Does the words TPMS actually light up or is there a picture of a tire with an exclamation point lit?

If filling the tires up with air and driving the car over 30mph doesn't turn the light off than chances are there is a problem with one of the sensors. Usually they are the part of the system that commonly fails.

Continuing to drive with the light on will not harm anything. Its just a tire pressure monitoring system. Basically warning you when a tire is low and prevents rapid tire wear or running it flat.

dtc code p0171 vehicle idles very rough - IDLE FAST AFTER IT WARMS UP CODE PO171

Code PO171 : System too lean (bank 1)





Description : The adaptive fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.



You may have a vacuum leak, stuck IAC Valve or dirty MAF. You may find that if you remove the internal Sensor from the MAF Case that some debree has collected on the thin wire. If you find debree, use a Q-Tip to clean it. DO NOT USE CHEMICALS TO CLEAN IT. If no debree is found, try a Known Good MAF Sensor. Still no fix, move on to testing for a vacuum leak. ( listen for a whistle noise or spray some starting fluid around the intake area while the engine is running). The IAC Valve (Idle air control) may be stuck , remove it and clean the carbon and reinstall if no vacuum leaks are found. Feel free to check out some of the other resources on the website as there may be some helpful information available.

where is the right front 02 sensor

QUESTION:

Where is the right front 02 sensor at on a 1998 Chevrolet ss z28 Camaro 5.7liter and do I just unplug the old one and plug in the new to get the engine lite to go off?

ANSWER:

The right front O2 sensor would be on the passenger side exhaust before the catalytic converter. It requires a 7/8 wrench to remove it.

As for the light going off, if this is why the light is on, then yes, replacing it will make the light go out.

check engine light came on and a mechanic read the code and it came up P1400

QUESTION:
Recently my check engine light came on and a mechanic read the code and it came up P1400 which is the manifold differential pressure sensor circuit. I have a 2000 Mitsubishi Galant; does this need to be repaired by a Mitsubishi dealer or can I take it to any auto repair facility?

ANSWER:
P1400 is an MDP sensor. on turbo equipped engines a special sensor is used to measure manifold pressure (MDP=Manifold differential pressure)...or the difference between manifold pressure and barometric pressure. the engine controller has seen values outside of what is programmed normal and therefore set the code. manifold pressure sensing is critical to fuel management. if the sensor is remote mounted and has a hose going to it...check the hose for splits, holes, soft places that might collapse, kinks or anything else that might prevent the pressure signal from reaching the sensor. if it's not that simple...you may a have a failed sensor or engine controller. to sort that out you need to do some specific pinpoint testing using the trouble tree for that code plus a DVOM...at the very least.

Most auto mechanics would probably just change the sensor and send you on your way, after charging you a hefty fee for the part. If it were my car I'd check for vacuum leaks everywhere, including all devices that use vacuum (especially the ones going to the sensor). While it could be a bad sensor just the same, I have a suspicion that the code is giving you a symptom and the real problem might be a vacuum leak or valve cover gasket, etc.

How do I extract the check engine light codes?

QUESTION:

I have a 1995 Ford Mustang GT and my check engine light is on. How do I extract the codes? Do I need a scan tool or can I do it without one?

ANSWER:

You do not need a scan tool to extract the codes on this vehicle. This vehicle is OBD I and does not switch till 1996 so you do not need a scan tool. Basically you install a jumper wire or paper clip in the diagnostic test port located under the hood toward the passenger side firewall. Once the jumper is in place, you turn the key on (do not start engine) and the check engine light will flash the code. Here is a link to Complete Instructions and a full list of Ford OBD I Check Engine Light Codes with descriptions of each code: EXTRACT FORD CODES

Where can I find out what my check engine light codes mean?

QUESTION:

Where can I find out what my check engine light codes mean? I took my car to the dealer and paid them to scan my codes. After paying them for this, i had to argue with them to get them to tell me what codes they found. I want to look up the codes for myself. Can you help me....

ANSWER:

In the future when your check engine light comes on, if you purchase a Scan Tool, you can skip the trip to the dealer. Once you have the codes, you can look them up easily.

COMPLETE LIST OF CHECK ENGINE LIGHT TROUBLE CODES. You will even fine out how to extract the check engine light codes without a scan tool on older vehicles.

slip, brake , and vsm light all light up at the same

QUESTION:
2005 Infiniti qx56 v8, why do my slip, brake , and vsm light all light up at the same time when ever they want to? I turn it on and pull off and all three are lit up in my odometer I am not sure why. My brake is not in but the light is still on and so is the slip light and the vsm light. I don't know what it is.

ANSWER:
There are several reasons for the lights to come on. About the only thing you can do without a scan tool is check the brake fluid level in the master cylinder. If it is close to the minimum level it may drop below on turns and stopping which will cause all of the lights to turn on.If it is full,you will have to have the system scanned to determine what is failing and either make the repair yourself or have it repaired.

tried to connect with scan tool, no communication

Question:
1995 Mitsubishi eclipse gs-t tried to connect with scan tool, no communication. car has OBD2 port and am using a MAC taskmaster with the latest updates.

Answer;
In most cases when a scanner will not communicate, it is due to a blown fuse. It is usually the cigar lighter/radio fuse but not limited to. Check and replace any bad fuse and it should work.

2005 Chevy Silverado error code P0449 registers

Question:
2005 Chevy Silverado error code P0449 registers when cleared it comes back after a couple starts. What could be the problem

Answer:
This is usually a problem with the Evaporative Emission Canister Purge Solenoid. If it was me, I would do a bit of troubleshooting BEFORE replacing parts. You could just have a loose or broken wire or connector.

p0720 code a put and output speed sensor on the car

what is the most likely cause for a p0720 code a put and output speed sensor on the car is a 2001 Suzuki SUV with a 4l30e the transmissions 1-2 shift is a late one shifts to second very late all other shifts seem good

Answer:

That is an output speed sensor problem. You need to have your output speed sensor replaced. This will cause the transmission to shift erratically due to it not knowing the correct speed of the vehicle. This is a pretty common problem with several vehicles.

my 2006 ford escape 2.3 litre 4x4 light flashes 8 times... what does it mean?

The light flashing 8 time means that the computer is getting invalid wheel speed information. This could be mismatched tires (2 new tires on one axle with 2 old tires on the other) or even 2 different size tires. Or could even be a bad wheel speed sensor. You need to get somebody with a scan tool to see if they can pull the codes for you. A parts house normally will do this for free.

Automotive Scan Tools - Code Reader

Professional garage technicians know well that there are a number of different great scanners available. For example, there are some great scanners that are designed to scan for air bag and ABS codes. OTC makes a great air bag and ABS scanner that can diagnose and clear all air bag, ABS, and even engine codes.

When a car problem occurs, the first step is to trouble shoot the related system. Then, perform simple tests that can lead you to the cause of the malfunction and the repairs needed to correct the problem. Sometimes You need the right test equipment. There are many different automotive SCAN TOOLS to choose from. Select one that meets your needs. More Scan Tools.

2001 olds 4.0l codes p0101,p0121,p0171,p0174,p0300

P0101 Mass or Volume Air Flow Circuit Range/Performance


P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem

P0171 System too Lean (Bank 1)


P0174 System too Lean (Bank 2)

P0300 Random/Multiple Cylinder Misfire Detected


More than likely these are all related to a failed MAF Sensor and when you have it removed(since it is connected to the throttle body) clean the inside of the throttle body around the butterfly. This should take care of your problems. The codes will need to be reset after the repairs are made to get the check engine light to go out.

2003 suzuki xl7, O2senser problem, service engine soon

Question:
I have a 2003 Suzuki xl7, O2senser problem, service engine soon light came on, it read #1, o2sensor circuit, no activity, bank 1 sensor 1 po#134 mod$0i #2 po134 o2 sensor no activity, bank 1 sensor 1, able to clear, but it comes back on in about 30 to 40 miles

Answer:
Not much diagnosing can be done without having a scan tool that can read the data from the oxygen sensor but, the oxygen sensor is more than likely not responding to the oxygen content in the exhaust and the only repair is to replace it but first make sure all fuses and the oxygen sensor relay is good, you can just swap the relay with another on, also unplug the sensor and make sure you have 12v and ground going to it, if so replace the sensor. the number 1 oxygen sensor is the one before the catalytic converter.

codes: P0003, P0171 & P0174. The engine just started running very rough. Check engine light is on.

I am getting 3 codes: P003, P0171 & P0174. The engine just started running very rough. Check engine light is on. it is a 1999 ford f150 4x4 5.4L 120000 mi. Is this something that would come on suddenly? Truck was running fine and I stopped to get gas and it started running rough on restart after fill up

Answer:

This is a great example of a vacuum leak. More than likely the intake gaskets are shot and need to be replaced as this is the most common issue with the fords and these codes.

It is possible to happen all at once, it is possible that you just got some bad gas then. I would put some octane boost in it and run the gas out then fill it with good gas from another station. If that doesn't clear it up, then you will need to replace the intake gasket or repair the vacuum leak. by spraying brake wash around the top of the engine(not on exhaust) while the engine is running and listen for the engine to change to stumble.

Diagnostic Trouble Code Definitions