When did the OBD2 emissions code come out?
The “II” is the next generation of emissions standards and codes for all vehicles sold in the U.S. from 1996 to the present, domestic and imports. The OBD2 system is primarily for emissions control.
What is the diagnostic code for catalyst system efficiency?
P0420 is a diagnostic trouble code (DTC) for “Catalyst System Efficiency Below Threshold (Bank 1)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic.
What do the numbers mean in the OBDII diagnostic code?
What you get is a five-digit alpha-numeric code such as “P0304”. The first digit is a letter corresponding to the main system causing the trouble code: The next four digits are all numbers. There is never a letter “O” in the OBDII diagnostic code.
What does OBD2 stand for on a car?
The “II” is the next generation of emissions standards and codes for all vehicles sold in the U.S. from 1996 to the present, domestic and imports. The OBD2 system is primarily for emissions control. Its basic components are the catalytic converter and strategically-placed oxygen sensors.
What causes a check engine light on a Miata?
This is done by opening and closing an EGR valve. The Miata’s computer calls for the valve to open and close based on a number of factors. If the computer senses that this is not being done properly (valve stuck open or closed or lines plugged), then the CEL is turned on.
How to read Mazda OBD code without OBD scanner?
Connect LED test lamp between terminals FEN and B+ Fig. 1 . NOTE: Connect LED test lamp positive connection to DLC terminal B+. Switch ignition ON. Count LED flashes. Note trouble codes. Compare with trouble code table.
How does the EGR system work on a Miata?
The EGR system recalculates exhaust back to the intake manifold to lower the oxygen content of the intake gases, thereby cooling the combustion chamber, which in turn lowers NOx emissions. This is done by opening and closing an EGR valve. The Miata’s computer calls for the valve to open and close based on a number of factors.
What does code 0120 mean on Mazda OBD 1?
No short flashes in a group indicate ‘0’. For example: Trouble code 0120 displayed Fig. 3 . Switch ignition OFF. Rectify faults as necessary. Ensure ignition switched OFF. Disconnect battery earth lead for at least 30 seconds. Depress brake pedal for at least 20 seconds. Reconnect battery earth lead.