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Code Readers

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Can I Fix My Car with a Home Code Reader/Scanner?
Most cars today (anything manufactured after 1996, actually) have an onboard computer that stores trouble codes when something goes wrong with a major component in the engine, transmission or emissions system. By connecting a code...
Should I Buy My Own Code Reader or Scanner?
All cars made from 1996 onward have an onboard computer that detects faults in the engine, transmission and emissions systems, and communicates problems through lights in the dash (your Check Engine Light, for instance)....
What's the Difference Between a Code Reader and a Code Scanner?
In order to determine why your Check Engine Light is on, a mechanic will connect a handheld device to the OBD II connector under your dash (in a vehicle made in 1996 and onward)....

Related questions

Question
ABS T/C error light
Hey there, thanks for writing in about your 2006 Buick Terraza. There is a possibility of the connector C305 under the drivers seat on the rear getting corrosion and damage from water getting on the connector. The connector is not...
Question
EGR P0404 code accelerating. 2005 Buick Terraza
For this code, there is a related technical service bulletin 06-06-04-003D dated March 20,2007. The TSB calls for installing a new EGR kit consisting of a new valve, tube, and wire connector, and directions to reprogram the powertrain control module....
Question
Check Engine Light codes. 2006 Mercedes Benz E55 AMG
Since you are getting many different codes from different areas of the engine, you may need to have the system hooked up to a factory scanner since most of these generic codes do not cross over in my repair software....
Question
Key not recognized by truck - 2006 Mitsubishi Raider
Hello. I would usually start by checking the battery and the connections at the battery. If there is low voltage in the system, then this will occur. If the battery and connections are fine, then the issue is either in...
Question
Torque converter vibrates - 2005 Chevrolet Avalanche 2500
Torque convertor "shuddering" is a cycle where the torque convertor tries to lock up, can't, and re-cycles repeatedly. General Motors has a service bulletin - TSB Reference #3438A, that addresses this issue. Discuss this issue with your dealer.
Question
Replaced oxygen sensors, but code P0135 still visible - 1996 Lexus LX450
P0135 is a "heater circuit" malfunction in the O2 sensor. This is usually a fused circuit. Check your Owners Manual to verify that it is fused, then check that fuse to make sure it isn't blown ("something" caused the old...
Question
Load on truck's engine causes loud knocking noise
Hello. It sounds like there may be a problem with the piston or the valves in cylinder 5. Loose rod bearings to the piston can cause a knocking noise and/or a misfire condition. A worn out piston can also cause...
Question
Volvo V50 Won't start new ABS
Hey there, thanks for writing in about your 2007 Volvo V50. You may have to take the vehicle to the dealer to have the systems flashed. The ABS control units are mated to the vehicle, and will not work when...
Question
Coolant leak codes
The code P2187 indicates a lean running situation at idle. More parameters will need to be checked to get to the bottom of this issue. Sometimes false reading from a malfunctioning mass air flow sensor may mess with the vehicle's...
Question
Gas reset button location
Hello. Diagnostic trouble code P1631 is an indication that the theft deterrent password is incorrect. The theft deterrent feature for your vehicle will shut off the fuel to your car until the proper password is sent to the PCM. A...
Question
A Sensor is Faulty
Hello. If the speedometer is not working and you are getting this code, then the vehicle speed sensor needs to be replaced. This will cause all of this to occur. This sensor is located on the transmission. In some cases,...
Question
Fluctuating coolant readings
Hello. Your fluctuating coolant temperature may be caused by a cracked cylinder head or leaking head gasket. It sounds like you have replaced everything else that could be causing this issue. If the head is cracked or the head gasket...
Question
Codes p0136, P0141
Although these codes are both for the downstream O2 sensor, they are completely different. The first code, P0136, has to do with actual sensor performance. The second code, P0141, has to do with the sensor heater circuit performance. The...
Question
Stalls without warning
I have never seen a DTA's message displayed on the dashboard of any vehicle, so I'm not sure what you mean. To determine the problem, you need to "catch the vehicle in the act." Checking fuel pressure and spark when...
Question
Code P2020, and satellite navigation and DVD problems
Hello. The P2020 code is a manufacturers code and not a generic code. The pinpoint test for the code should be done before replacing the manifold flap sensor. Once the pinpoint test is done, it will isolate the failed part...
Question
My check gage light turns on and now my check engine is turning on as well. What can be the issue?
Hello. Are the warning lights turning off and on? This may be a sign that the issue is intermittently showing itself and the scan may have done when the code wasn't triggered. The computer is constantly running tests and can...
Question
Which oxygen sensor usually fails first? I don't have a code reader to tell which one is bad.
Hi. In my experience, I haven't really seen one oxygen sensor fail more than the other one. Considering the year of the truck, I would replace all the oxygen sensors on the truck because, if one is going bad, then...
Question
i need to know the key sequence to get the check engine codes
Hello. The old style of retrieving codes was indeed done by turning the key on and off again. However vehiles manufactured after 1996 are equipped with OBD-II diagnostic systems. This means the driver or technician can acess and even control...
Question
I have a 1986 Chrysler Laser turbo with 13700 miles that failed emissions. Do oxygen sensors go bad from sitting around too long?
Wow, I almost bought one of these new back in 1986. It is possible that due to age, any number of sensors can be bad, even without a Check Engine Light being set. The best way to determine that is...
Question
The Check Engine Light came on after washing my Durango
It sound like you got water into some of the electrical connections from the water that is sprayed sideways and from the bottom of some of these car washes. Also, your car was running, which could cause the water to...

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