Are you struggling to find out which O2 sensor you actually should replace?We get a lot of questions about how to locate which O2 sensor is bank 1 and which one is bank 2. Show That’s why I decided to write this article to sort it out once for all. It sounds really confusing with all the “Bank 1 Sensor 2 etc” but if you have learned it once, it’s not that complicated. I often hear about people that replaced the wrong sensors because they did not have the knowledge of which sensor they replaced. After you have checked out this article you won’t do the same mistake! What is bank 1 vs bank 2? Bank 1 vs Bank 2 That’s why I do not want to tell you a side which is bank 1 & 2. You can have bank 2 on both inline engines and transverse engines (Engines mounted in the other direction). If you know which cylinder that is number 1, there makes no difference if you have an inline or transverse engine. Bank 1 is always on cylinder 1 – 3 – 5 – 7 – 9 – 11 and bank 2 is always on cylinder 2 – 4 – 6 – 8 – 10 – 12. What is Sensor 1 & 2? Generally, if we are talking about O2 sensors: Sensor
1 = Before Catalytic converter Front (Upstream O2 sensor) How can I find the cylinder numbers? The most secure way is either to look if you can find it on the crankcase cover or find it the cylinder order in your service/repair manual. You can also call your authorised dealer and ask them if they have any information about it. You could also try to search the internet for it by searching for your engine code + firing order or cylinder order. If you are not sure, you can ask us a question for free at our homepage. Mechanic recommendation: Here are the steps you can follow using the OBD2 scan tool to find out which side is bank 1 and which is bank 2.
By using this method, you will also solve any misinformation in the DTC tool and you will be 100% sure that you replace the right sensor. I have the DTC code P0420 also, which one should I fix first? The P0420 code can be triggered by a faulty O2 sensor. My recommendation is to troubleshoot the O2 sensor first as it may fix the P0420 code. Check if you can find any exhaust leaks, which could trigger both the P0420 and O2 sensor DTC code. If you want more help on how to diagnose the P0420 code, you can check out our P0420 Troubleshooting article. SummaryIf your DTC code says: Bank 1 Sensor 1 = O2 sensor located before the catalytic converter, on the side with Cylinder #1 I hope you enjoyed this article and found it helpful. If you did and know anyone else who might find it useful please go ahead and share it with them. If you need any help or assistance in finding the best diagnostic scan tool for your need, please get in touch and we'll be happy to assist. Is bank 1 sensor 1 upstream or downstream?Bank 1 Sensor 1 means Upstream Right/Rear;Bank 2 Sensor 1 means Upstream Left/Front;Bank 1 Sensor 2 means Downstream Right/Rear;Bank 2 Sensor 2 means Downstream Left/Front.
Is bank 1 sensor 1 before or after the cat?However, bank 1 has two sensors, of which sensor 1 is located near the engine before the catalytic converter, an upstream sensor called pre CAT, and sensor 2 is located after the catalytic converter called post CAT, a downstream sensor.
What side is bank 2 sensor 1?Bank 2 Sensor 1 (a.k.a. B2S1) is located on the side of the engine with cylinder 2 in the firing order and the O2 sensor situated in front of the catalytic converter. Depending on the car's make and driver orientation, it could be found on either the driver or passenger side of a vehicle.
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