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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
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
CEL limp mode reflash
Hello there. The type of issues you have described are not uncommon with the newer F series diesel trucks. The technical service bulletins are put out as a way to get vehicles repaired properly once a common failure point is...
Question
Won't change gears p2768
Hello there, this is not an uncommon occurrence. The P2768 code is referencing a fault with the input speed sensor. When this occurs the transmission may suffer during gear changes since the car's computer can not tell it when the...
Question
Cruise control quit working
Thanks for writing in about your 1998 Chevrolet C1500 Suburban. I would want to diagnose the brake pedal switch first so I wouldn't replace one that is working fine. A technician using scan tool will easily be able to see...
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
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
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
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...
Question
The code reader for my engine light says P0306P. What does the second P mean?
The P means powertrain. The second P is not normal and may just be the scanner you are using. This vehicle does not use the second letter P. I would disregard it. As far as the P0306 it indicates a...
Question
Car completely died after diagnostics scan, dealer says to replace kvm and body control module, very expensive! How and y?
Hello, thank you for writing in. You are in a tricky situation. It is very rare that simply pulling the diagnostic codes with a scanner would cause any kind of issue. The problem has likely stemmed from the keyless vehicle...

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