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P1346 and P1351. is it always a timing belt?

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Old 03-21-14, 06:57 PM   #1
RoMiLex
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Default P1346 and P1351. is it always a timing belt?

With more research I ran across someone throwing those codes and the cam gear mechanisms seemed to be bad. He replaced both oil control valves and recently did a timing belt job. So it seems like it couldnt be really anything else.
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Old 03-21-14, 07:08 PM   #2
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I don't know what 1351 is but did you replace the VVTI oil control valve filter?
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Old 03-22-14, 07:20 PM   #3
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I pulled them both out and they didnt seem to have filters. I have a 98 GS400. Arent the 300s the ones with the filters? Also when I pulled them out they had a used kind of color but were very much clean. My first oil change welt like this drain oil, Valvoline Max Life blend, ran for 10 minutes, drain, filter change and Mobil 1 15,000 Synthetic. I was hoping the Max life would get into the bearings and also the VVTi solenoids to clean them out. That didnt work.

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Old 03-30-14, 07:38 PM   #4
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my 99 rx300 started running really ruff sputtering, codes thrown were p1346, p1349 vvt system malfunction, a/f sensor circuit response malfunction bank 1 sensor 1 bank 2 sensor 1. I checked the timing belt and it looks good its tight and all the timings marks are lined up so what should I do next I really need the car going and don't know what to try next?? help please
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Old 03-30-14, 07:57 PM   #5
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Crazy thing is, my car feels like it runs perfect.
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Old 04-04-14, 07:35 PM   #6
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Can I get more input before digging into my engine for 20 hours?
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Old 08-09-15, 09:25 AM   #7
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Originally Posted by RoMiLex View Post
Can I get more input before digging into my engine for 20 hours?

Did you figure this out yet? My 98 gs400 threw p1346 and p1351 code after I bought it. The car drove fine for 100 miles. Checked the timing and the timing was off but ran smooth. Lined the cams and everything up and everything sound better. Than started to give me the same codes. Cleared it, drove it for 10 minutes and it was good but came back. Don't know what to do.
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Old 08-10-15, 06:09 AM   #8
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Originally Posted by 2k4CamkilA View Post
Did you figure this out yet? My 98 gs400 threw p1346 and p1351 code after I bought it. The car drove fine for 100 miles. Checked the timing and the timing was off but ran smooth. Lined the cams and everything up and everything sound better. Than started to give me the same codes. Cleared it, drove it for 10 minutes and it was good but came back. Don't know what to do.
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