Question about 2002 Buick LeSabre
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Posted on Jan 02, 2017
MAP and O2 sensor are two separate items. MAP, reads manifold pressure, O2 reads exhaust content. O2 sensor often is a false reading not to be ignored but should not be immediately changed till other items are corrected. MAP sensor is often mounted on the firewall and can be identified as having an electrical connector and a vacuum hose attached to it. (ask a parts house to show you one and it will make finding it easier) Check for vacuum leaks in the hose and make sure the hose is well connected at both ends before changing the sensor. You may also want to clean the Mass Air Flow sensor located between the air duct hoses running from the air filter box to the throttle body. There are two small wires inside it that can be cleaned carefully with carb cleaner and a Q tip.If dirty, it can cause idle fluctuations or stalling.
Posted on Jun 17, 2009
If everything you described is true, then there's a strong suspicion it's the ECU. Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Since you stated there were no trouble codes (DTC's), there's one last thing to try... ZERO out the ECU (do this by disconnecting the battery cables from the battery posts... connect the cables together for 30 seconds (this ZERO's out the ECU). Afterward, reconnect the cables to the battery. If the problem recurs (and there's no DTC's), the problem is in the ECU.
Posted on Oct 18, 2009
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