1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Code P1133B

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Old 03-13-2008, 01:36 PM
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Default Code P1133B

What is it?

My muffler was modified. And the shop removed the Catalytic Conv. Is that why this happened?

thanks
Old 03-13-2008, 01:55 PM
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Let me have the name of the shop that removed your cat. I'm low on cash, which is far more important to me than the absolute loss of low-end grunt you just cost yourself.



Yes, you have a very foolish muffler shop. In the future, when you post a code, post the definition from Techinfo so we don't all have to go look it up.

You have no Cat. So your O2 is having issues. Or they simply removed it, and your PCM is still looking for it.

Great shop. Just keep 'em away from your cars from now on, ok?
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