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I have a 2000 Sebring convertible 2.5,I changed the spark plugs and did the valve cover gaskets put everything back as it was and now it will not start,it started before I did the work to it,I checked to see if I had spark,no spark,Is it possible the Distributor can go bad ? the plugs that go to it have power
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aaECM internal fault
Explanation
aaECM unable to communicate on SPI line
Probable cause
aa1.-Shorted input sensor
aa2.-Shorted electrical circuit
aa3.-Failed ECM
Troubleshooting P0420
Definition
aaCatalyst efficiency low-bank 1
Explanation
The oxygen sensors monitor the Catalytic Converters
ability to store oxygen.
Probable cause
1.Catalytic converter defective (failure
possibly due to #2,3,or 4)
2.Engine misfire or running condition
3.larg vacuum leak
4.engine oil leakage into exhaust-valve guide
I checked for vacuum leaks but most of it has nothing to do with spark,the car ran fine before I decided to change the plugs and fix the oil leaking into spark-plug holes,the ECM
sounds Scary
ECM replacement is not that bad but it's not cheap. Search on line. For about $200, you send them your VIN and mileage and they send you a rebuilt computer that pretty much plugs in. I did it for my 2001 when I got the dreaded 601 code and the problem was gone.
Replacement of the catalytic converter is much worse.
But if the car was running fine before I started working on it I wouldn't think the catalytic converter is the problem for no spark,what do you think ?
Thanks for the prompt response