Questions tagged [dtc]

Diagnostic Trouble Code

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12
votes
1answer
490 views

Are widebands known to go lazy over time?

I know narrowbands can go lazy with time, but what about widebands? This is a sequel to the cold-start misfire mystery. It turns out that we were looking at the wrong PID's for the front O2 sensor ...
13
votes
3answers
33k views

2005 Dodge Ram: Easy way to diagnose code P0420?

My truck is reporting a code P0420, which apparently is "Catalyst System Efficiency Below Threshold (Bank 1)" which can either be the catalytic converter or the rear O2 sensor. The code came on at ...
3
votes
3answers
169 views

Is hot desert weather the source of my recurring car problem?

I have a 2004 ford ranger with a short history of problems...the engine is v6 3.0L OHV. 1) It died 2 summers ago, stopped right in the road, around noon in the middle of July. I live in Tucson so it ...
9
votes
2answers
1k views

How do I go about troubleshooting DTC codes?

When the check engine light (CEL) comes on, there is usually a diagnostic trouble code (DTC) that can be read from the OBD-II (onboard diagnostic) port on modern codes. How do I go about using the ...
6
votes
2answers
8k views

Any open-source OBD scanner analysis tools?

I've been having some weird problems with my '06 Pontiac G6, and finally broke down and bought a Bosch code scanner to see if the DTCs could tell me anything... they didn't. This scanner has the ...
9
votes
3answers
59k views

Do fault codes get recorded with a time stamp into a log with a history of DTCs?

Just scanned my vehicle for the first time to check out the code for a Check Engine Light. I grew curious if these fault codes get logged somewhere with a date and time stamp of some kind at the time ...
8
votes
5answers
924 views

Looking for easy ways to set error codes

A lot of people want the check engine light to go off. I am doing some research for school and I want it to come on. Does anyone know some simple problems or faults I can create with a vehicle in ...
6
votes
1answer
2k views

2000 Audi A4 1.6 weak motor power

Just few days before I wanted to take Audi A4 B5 1.6 (year: 2000) to 'preventive' service. I've started the car normally, only the motor sound was very weird. So I tried to make a test drive. I couldn'...
1
vote
1answer
3k views

GM P0420 Code - Eliminating Possible Causes in Chevy G10

I have a 1996 Chevy G10 van with 14X,XXX miles on it. It has the 5.0 engine. I do not have a scanner myself, but, according to a shop, the van was throwing code P0420. According to my research, this ...
0
votes
0answers
49 views

Nissan Qashqai “Test Mode”: What does the data mean?

I learned about a "test mode" for the display, which can be used for diagnostics, without an obd reader. I managed to get inside the test mode, but I am baffled by the data and am not sure what it ...