What are the symptoms of a bad oxygen sensor?

Check engine light, poor fuel economy, rough idle, engine misfire, failed emissions test, black exhaust smoke.

Old Iron!Has your car started drinking gas like crazy lately?

My mechanic store recently had an 06 Camry come in and the gas mileage suddenly spiked to 13 liters per 100 kilometers.The owner said that stepping on the gas was like flashing an OPPO cell phone - it was just draining the battery and not putting out any power.The result you guess what?The decoder read out a P0420 fault code, typical what are the symptoms of a bad oxygen sensor Great gift!

Engine yellow light becomes resident NPC

Now new cars are like smart machines, the dashboard yellow light is lit up more diligently than the "Legend of Zhen Huan" in the Hua Fei rolled her eyes.Last week, I met a 00-year-old girl, she said the lights lit up like a B station pop-up, and it turned out that the downstream oxygen sensor is hanging.This thing is bad tailpipe emissions directly exceeded the standard by 2 times, EPA data said that 23% of the U.S. emissions failures are caused by it.

Can you believe the exhaust pipe sings?

One Uber driver said that his car has been making a "pupupupupu" ASMR sound recently, which is very similar to the bubble sound in wechat voice.I took a borescope and disliked the exhaust pipe, and the three-way catalytic converter was clogged up like the 101 freeway in the morning rush hour - the delay in the oxygen sensor data caused the air-fuel ratio to be messed up, and this symptom was as outrageous as using pearl milk tea to wash the throttle.

Cold start into a bouncy scene

Have you ever encountered a car that shakes like it's dancing to "Subject 3" when the ignition is turned on?Last month we dealt with a Tesla pickup truck that actually stalled three times while waiting at a red light.The owner said that the car is now more capricious than the post-00s rectification of the workplace, but it turned out that the oxygen sensor was corroded by antifreeze.SAE study said that the sensor poisoning will lead to ECU miscalculation, and the fuel consumption can soar by 15%!

Fixing it is more exciting than removing a blind box

The last time I changed the sensor for a Grand Cherokee, the screws were more rusty than Northeastern soy sauce.The customer was chattering next to me, "This thing is worse than a love-brain best friend!"If I say, encounter what are the symptoms of a bad oxygen sensor quickly check, don't use expired foundation concealer like hard to carry.AutoZone buy a detector to read their own code, than in the jittery sound to see the repair of the car pseudo tutorials more reliable.

The smell of exhaust fumes is worse than snail powder

A foreign student client said the exhaust smelled like a biological weapon, and I almost triggered PTSD when I smelled it. it was like pouring Starbucks Cold Brew into the gas tank - unburned gasoline going straight into the exhaust pipe.When the oxygen sensor fails, the ECU doesn't even know to correct the fuel injection, which the EPA says can exceed NOx emissions by 400%!

Seriously, fixing a car now is like playing "Sheep a Sheep", it looks simple on the surface but actually has a deeper set of tricks.The next time you smell a sweet, greasy odor from the exhaust, don't think it's an upgraded version of the car's aromatherapy, but quickly check what are the symptoms of a bad oxygen sensor.After all, no one wants to drive a Corolla that gets better gas mileage than a Maserati, right?

References:
SAE Technical Paper 2021-01-0682
EPA Emissions Testing Annual Report 2023
California Air Resources Board Maintenance Guide v7.2