Persistent 0300 code on my DII— could use some counsel
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Overlanding
Joined: Jul 2018
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Persistent 0300 code on my DII— could use some counsel
I bought my 1999 DII in the fall of 2018, and have a persistent issue with misfire codes (x3xx variants). Since September, I've done the following:
- New Duralast battery (M+S light issue)
- Plugs + wires
- Ignition coils
- Crank position sensor
No codes for a little over a month, but since then have been getting the SES light with a persistent 0300 code. Took it to my local guy, who cleared the code and told me it was likely that super cold Chicago temps were causing sensor issues. Today is a beautiful 40º day, and the code is back. I've put a good chunk of money into it with the above work, and its driving me nuts that I can't get the SES to stay off for over a month. Any ideas what might be the root cause? Poking around the forum it seems that O2 sensor and MAF are possible next steps ... any help is much appreciated.
- New Duralast battery (M+S light issue)
- Plugs + wires
- Ignition coils
- Crank position sensor
No codes for a little over a month, but since then have been getting the SES light with a persistent 0300 code. Took it to my local guy, who cleared the code and told me it was likely that super cold Chicago temps were causing sensor issues. Today is a beautiful 40º day, and the code is back. I've put a good chunk of money into it with the above work, and its driving me nuts that I can't get the SES to stay off for over a month. Any ideas what might be the root cause? Poking around the forum it seems that O2 sensor and MAF are possible next steps ... any help is much appreciated.
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