Question about 1995 Buick LeSabre

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Fixed check engine trouble code but light with same code comes on

Code for trottle position sensor made check engine light come on. light stayed on all the time. Replaced trottle position sensor. Test showed sensor bad. Light went off for 500 or so miles. Check engine light now sometimes comes on[ cuts cruise off when does with cruise on]. The same trottle position sensor code shows up now, with new sensor. What do I do now? Do I replace the same sensor again? The car is a 1995 Buick LeSabre Limited. Also on same car I have problems with transmission shifting into overdrive, even after replacing filter and fluid in pan. Also added Lucus transmission fix with Castrol transmission fluid to refill transmission. I had no proplem shifting for a while after change. Problem shifting happens now just every once in a while.Is transmission flush and new filter needed now or what? I have around 8,000 miles on transmission fluid/filter change now.

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Your transmission problem could be related to the TPS sensor. The TPS sensor indicated to the PCM when and what gear the transmission should be in. As for the Lucas and other additives to the transmission may be doing it more harm then good, As the transmission oil is thicker, the transmission line pressure increases. The PCM try's to compensate for that by letting the converter lock up clutch to slip and the fluid retention in the solenoid to change gears stick causing it to shudder between gear shifts. Recap, Check the TPS sensor readings and the Wire Harness. Look for loose connections and corrosion that may not be giving the proper readings to the ECM. Rescan the car for any DTC codes and most transmission chop can do that for you if your going to get it serviced there anyways. Have the transmission fluid flushed and filter changed, and have them do a transmission line pressure checked, there are additives out there to keep the fluid from foaming which is ok, but changing the fluid's weigh can cause transmission failure. Good luck and hope this helps and keep me posted, be glad to help.

Posted on Jun 14, 2009

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P0340 OBD-II Trouble Code - Camshaft Position Sensor Circuit Malfunction

This indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM. Don't just replace the CPS (camshaft position sensor) and think that will definitely fix it.

Symptoms can include:
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Causes: A code P0340 could mean one or more of the following has happened:
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* Visually inspect all the wiring and connectors in the circuit
* Check for continuity in the circuit wiring
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This involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms.

Causes: A code P0133 may mean that one or more of the following has happened:
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Possible Solutions: The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the front Bank 1 oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
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Cranks but will not stay running


Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there.
There are just too many possible causes for the problem you describe. Example: Sensors like the Mass Air Flow (MAF), Throttle Position Sensor (TPS), Manifold Absolute Pressure (MAP) sensor, Crank Position Sensor (CKP), Engine Coolant Temperature (ECT) Sensor, Intake Air Temperature (IAT) sensor, vacuum leaks, intake air hose leak, Wiring & connectors, clogged intake air filter, bad/contaminated fuel, malfunctioning injectors, poor ignition/spark or spark plugs or wires, Major Engine Mechanical problems, Out of Time, etc. etc. etc.

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The are many things that can cause your "check engine" light to stay on. One possibility is that although you have fixed the trouble code for your crankshaft position sensor, the code has not been erased from the computer's memory. Another possibility is that you have another issue going on that is causing a new trouble code to come up. You're going to need to have your car hooked up to a ODB-2 engine code reader to see what the issue is. These code readers are available for purchase at any auto parts store. In addition, many of your local auto parts stores will check trouble codes as a free service to customer. If not, many parts retailers offer the option to rent one of these code readers. Which ever way you decide to go, run a full engine/emissions trouble code check. If the only code that comes up is the code that came up previous to fixing your positioning sensor, then all you need to do is erase the trouble code from the computer's memory. (Most code readers have the option to erase trouble codes, but if you're going to rent or buy one, I would suggest that you check to make sure that the code reader that you're getting is capable of erasing trouble codes as some code readers only indicate the codes and will not remove them from your computer's memory.) If your trouble code scan reveals other codes, then you'll have to fix and erase them as they arise.

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Hope this helps! I'm sure once you've scanned your cars computer and erased any existing trouble codes, that you'll stop being annoyed by your check engine light, as I know how bothersome it can be. Have a great day!

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