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C. Walker, Jr.
C. Walker, Jr., Mechanic
Category: Buick
Satisfied Customers: 709
Experience:  Shop training and hands on experience.
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I need to replace my upstream oxygen sensor but i am unsure

Customer Question

i need to replace my upstream oxygen sensor but i am unsure about where it is located
JA: How has your mileage been lately? Have you checked the voltage?
Customer: its been down and i do not know what you mean with the second question
JA: Tell me a bit more about what's going on so he can help you best.
Customer: I need to replace the oxygen sensor i know it is the one in bank 1 i just need to know where that one is located
JA: Are you hoping to fix this yourself?
Customer: yes
JA: Great! What have you tried so far?
Customer: nothing because i am unsure of the location
JA: Is there anything else the Buick Mechanic should be aware of about your Buick?
Customer: nothing major
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Buick Mechanic about your situation and then connect you two.
Submitted: 4 months ago.
Category: Buick
Customer: replied 4 months ago.
it is a buick park avenue 2001 GM (3.8L)
Expert:  C. Walker, Jr. replied 4 months ago.

Here are the instructions you need. It is the upper sensor as shown in diagram. HOS1

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