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Code P0133?

Tiny
LIONELL8732
  • MEMBER
  • 2007 MERCURY MILAN
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 195,000 MILES
Hello, I recently replaced the exhaust manifold converter along with two brands new ngk oxygen sensors and my wife called and said that we have a P0133 code on. Need some help.
Sunday, September 10th, 2023 AT 6:03 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,947 POSTS
The code number is because of slow response from the sensor, the diagnostic trouble code (DTC) P0133 on your 2007 Mercury Milan indicates a problem with the upstream oxygen sensor in Bank 1, Sensor 1. Here's what this code typically means:

P0133: Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1)

I would say you have a defective sensor, but I would try clearing the codes and try it again in case it is a glitch in the system, or the new parts are recalibrating and it needs more time. Here is the location of the sensor so we can be on the same page. Check out the images (below). Please let us know what happens.
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Monday, September 11th, 2023 AT 5:32 PM
Tiny
LIONELL8732
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Okay, will keep you posted.
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Monday, September 11th, 2023 AT 9:57 PM
Tiny
LIONELL8732
  • MEMBER
  • 138 POSTS
Need help.
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Friday, September 15th, 2023 AT 10:13 PM
Tiny
KEN L
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Yep, I have seen the MAF sensor cause this problem. I would swap it out and then clear the codes. Check out the images (below). Please let us know what you find.
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Monday, September 18th, 2023 AT 10:33 AM

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