What is the Difference Between Bank 1 & Bank 2?

In this article we are going to take a closer look at this issue and help you understand what is meant by these bank terms. This should allow you to locate the issue in question and expedite your much needed repair.

What Are Banks 1 and 2?

The very simple answer to this question is that the “Bank” refers to the two sides of your internal combustion engine. Your engine should have two banks of cylinders one on each side of the engine.

These banks of cylinders are usually slightly offset so one is further forward than the other as viewed from standing in front of the engine bay. Bank 1 refers to the half of the engine where the cylinders are closest to the nose of the car, which means bank 2 is the other side of the engine.

If you are having difficulty verifying which side is which visually you can refer to your owner's manual. Generally speaking if you can identify cylinder 1 then this will be on the side of bank 1 and cylinder 2 will be on bank 2.

It should be noted that sometimes engines are mounted differently so the front of the engine may face the back of the engine bay or the front. This can obviously be confusing but as a rule the front of the engine is the side which has the crankshaft pulley.

Why Is Each Bank Important?

The error codes are telling us there is a problem in one half of the engine. Both halves may contain the same parts so if we were to replace a working part in bank 2 because we thought it was bank 1 then we will not have fixed the problem.

You save time and potentially repair costs by taking a beat to determine which side of the engine you are looking at. It is like measuring twice to cut once, if you get it fixed the first time then you don’t have to do it again.

Conclusion

Banks 1 and 2 are the two different sides of the engine with bank one usually being where cylinder 1 is located and bank 2 being where cylinder 2 is located. This can sometimes be hard to determine so checking on the specifications of your model and year might help you be more sure of which side of the engine is which.

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  • "What is the Difference Between Bank 1 & Bank 2?". Tow Ratings, http://towratings.net/blog/what-is-the-difference-between-bank-1-bank-2/. Accessed 29 March, 2024

  • What is the Difference Between Bank 1 & Bank 2?. Tow Ratings. Retrieved from http://towratings.net/blog/what-is-the-difference-between-bank-1-bank-2/.