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What are codes 12 and 34 for an 87 Chevy Beretta

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Hi, holly. Code 12 is "system normal". It is displayed anytime you start checking for codes. Only means the computer is working and diagnostics are working.
Code 34 is your trouble code: "Map sensor signal out of range, low". You probably need a new map sensor. Look for it possibly on the firewall, possibly a small rectangular black box with a 3 or 4 wire connector, and a vacuum hose attached. This sensor is critical for computer to know manifold pressure in the intake, so it can match fuel requirement to air for correct air-fuel mixture. If you can't find the Map sensor, have someone locate it for you. I don't think a new one would be very expensive.

Posted on Jan 04, 2013

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Posted on Jan 02, 2017

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