{"id":30408,"date":"2021-11-08T12:59:10","date_gmt":"2021-11-08T12:59:10","guid":{"rendered":"https:\/\/www.dubizzle.com\/blog\/cars\/?p=30408"},"modified":"2026-03-04T05:07:16","modified_gmt":"2026-03-04T05:07:16","slug":"car-diagnostic-codes","status":"publish","type":"post","link":"https:\/\/www.dubizzle.com\/blog\/cars\/car-diagnostic-codes\/","title":{"rendered":"Important Codes to Know on Diagnostic Test Machine"},"content":{"rendered":"\n

A diagnostic test machine is a vehicle diagnostic device that establishes a connection between your car and diagnostic software to detect issues with different components of the car from your vehicle’s systems. Each issue is assigned a different code.<\/p>\n\n\n\n

In this guide, we take a look at necessary car diagnostic codes and explain these car fault codes.<\/p>\n\n\n\n

Car Diagnostic Codes List<\/h2>\n\n\n\n
\"Important
A list of Important codes to know on a diagnostic test machine<\/figcaption><\/figure>\n\n\n\n

Car diagnostic codes start with the letter \u2018P\u2019 followed by a four-digit numeric code. To scan the issues, an OBD reader is plugged into the port under the driver’s dashboard and used as a car diagnostic codes scanner. Following is a list of car diagnostic codes on a diagnostic test machine.<\/p>\n\n\n\n

P0100 – P0199 \u2014 Fuel and Air Metering<\/h3>\n\n\n\n

These codes are used to monitor a vehicle’s fuel and air-fuel ratio to identify if an oxygen sensor <\/a>is failing, as well as its emissions and fuel efficiency.<\/p>\n\n\n\n

Codes within this range are indicative of the following issues:<\/p>\n\n\n\n