Question about Pontiac Grand Prix
I just had my tranny replaced about 1 week ago at a licensed dealership... all of a sudden it got really cold out michigan weather i drove my car from work and parked it in my garage about 2hrs later i get ready to go and it will not do anything, only a small click, the lights come on, the radio work the battery was replaced a week ago when the tranny was replaced, i have driven the car on the highway at least 3 times at about 30 miles each after the repair and it drove fine... any suggestions as to what i can try myself before taking to a shop im a young woman that knows very little about cars.
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Posted on Jan 02, 2017
I would suggest you check oil levels etc. Generally these cars suffer from the air mass meter / air sensor problems aswell as coil problems too. Did you ever get a solution to the problem?
Posted on May 01, 2009
You have a bad camshaft sensor. It's located at the back of the driver side valve cover. Takes 20 minutes to replace. I had exact problem and this solved it.
Posted on Jul 31, 2009
The P0420 code, usually associated with a weak cat converter, is in fact often caused by an ageing (weak) downstream O2 sensor. On both my cars at around 150K miles replacing the downstream O2 sensor was all that was needed to clear the code. No cat replacement was necessary. If one actually spends some time reading the diagnostics procedure for this code, they will find that the O2 sensor diagnostic is the first thing to do before replacing the cat converter. The downstream sensor, the one after the cat converter, gets "lazy" with age. This means that it no longer produces voltage signals as it used to. The result is that the voltage swings that come out of it begins to follow very closely the voltage that is generated by the upstream O2 sensor. When this happens, the car computer thinks the cat converter does not do its job (which might as well be the case too, but the O2 sensor is the first thing to try). With a code scanner with live data stream you can see the voltages coming from the O2 sensors. Check-out my write-up on the 2002 Toyota Prius cat converter replacement on http://www.pbase.com/kocho/exhaust_prius
- I got some details there. And see my comment for Dennis above here too
Posted on Nov 11, 2012
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