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What to Do If OBD Fails Annual Inspection?

2 Answers

LeCassandra

07/29/25 5:08am

OBD failure should be addressed by upgrading the vehicle's system at a 4S shop. OBD stands for On-Board Diagnostics system inspection. Starting from November 1, 2019, the entire process of tailpipe emission testing has been under OBD dynamic monitoring. OBD refers to the On-Board Diagnostics system inspection. If the vehicle has any emission control-related fault alarms or abnormal connections between OBD and the diagnostic tool, it may result in inspection failure. Vehicles purchased a long time ago are recommended to have their OBD systems upgraded at a 4S shop. Below is additional information on the causes of OBD failure and remedial measures: 1. Outdated OBD system; 2. Malfunctioning OBD system sensors; 3. Engine failure in the vehicle. Methods to reduce OBD failure include: 1. Refuel at reputable gas stations and use the fuel grade specified by the manufacturer; 2. For diesel vehicles equipped with selective catalytic reduction devices, use qualified urea produced by reputable manufacturers; 3. When the OBD light is on, promptly take the vehicle to a 4S shop for repair; 4. Use the vehicle normally, avoiding overloading or exceeding limits; 5. Do not modify, block, or dismantle pollution control devices of the OBD system without authorization.

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Elise

08/12/25 8:46am

Last year during my annual inspection, my OBD failed, which really gave me a scare. I immediately went to an auto repair shop for a check-up and found out it was an oxygen sensor malfunction—when this part fails, emissions exceed the standard. The mechanic used a code reader to diagnose the issue, replaced the faulty sensor, and after retesting, it passed. It cost me just over 200 yuan, which wasn’t expensive. Usually, I pay attention to engine maintenance while driving to prevent excessive carbon buildup, and I clean the air filter every six months to avoid such issues. OBD problems are common, but don’t delay repairs—otherwise, the next inspection could be even more troublesome, and you might even face fines. Remember to go to a reputable shop for repairs—it’s safe and reliable.

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