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Q:how do you know which one is bad?
A:If you look at the engine from passenger side towards your drive belt, bank1 is left and bank 2 is right. The code for the left one closest to the firewall is p1537.
Q:for this part there are two how would i know which one is bad the code is p1537 ,or should i change both at the same time??
A:You might as well change both honestly.
A:Looking at the engine from the passenger side at your drivebelt. Bank 1 is left Bank 2 is right. P1537 is the left closest to the firewall. No you do not need to replace both.