Question about 1989 Pontiac Grand Prix

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89 grand prix do thay have an exturnal o2 sencer or is it in the brain box

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Hello littleagle58: My name is Roger and i will help you. You did not say which motor you have in your car. The 2.8 has a oxygen sensor located in the exhaust manifold and is located between the engine and the firewall. The 3,8 has a oxygen sensor located left hand side at the rear of the engine. Should you need further help lease just ask. Please rate the answer. Thank You for using Fix Ya, Roger

Posted on Dec 30, 2010

  • Mkcvs89 Aug 19, 2011

    I have the 2.8 in my car how do i get to the o2 sensor?

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The o2 sensor is in the exhaust. It is in the Y-pipe on the back side (firewall side) of the engine.

Posted on Dec 30, 2010

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1 Answer

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If the car has 100,000 miles on it ,the
front (2) O2 Sensors will be slow to respond,
change them. You can see them with an
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(back probe with hat pin) Black lead from scope to chassis
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Clean MAF Sensor
Check Fuel Pressure at rail
New spark plugs
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