Pending; P1130 then week later P0125

I have the same code an poor gas mileage. I'll replace the front sensor. Mine is 4-cylinder so there's only two sensors. But it's really rusty, I don't want to break a stud getting it out
 
another update. 11-2-14, still running strong no check engine lights. problem still solved!

Thanks for posting this update! I've been having the same codes in my truck and looking for a solution. Planning on replacing the sensor and possibly thermostat if necessary. The whole process has been rather annoying because my CEL isn't working for whatever reason, so I've had to just check the codes over and over. But anyway, glad you got your issue solved!
 
I don’t mean to post something like this in a thread that’s already created, but I’m a new member, so I was searching for someone with my issue.

I’ve got a 1998 SR5 5VZFE
302,000 miles
Currently throwing a P0125 code. If I clear it, it will always come back, but sometimes with a P0130 and a P0133 along with it. Everything I’ve read points to the upstream oxygen sensor, so I went ahead and changed it, installed an oem Denso sensor, contacts in the connector are clean. I’m still getting the codes. Anyone think it can possibly be a coolant temp sensor not agreeing with the oxygen sensor? I was thinking that, but then why would I occasionally have the P0130 and P0133 codes? I know those both correspond to the upstream oxygen sensor. I’m in New York, and my truck has Cali emissions, but as far as I know, even Cali emissions trucks only had one cat until 99.

Just got the truck last week. And Got 13.8mpg to my last tank, would like that to be better haha! Also need to pass the NY emissions inspection.
Also hate to know that it’s runnimg in open loop and extra rich all the time, washing that oil off my 300k cylinder walls!

After I get this worked out, would anyone recommend an oil change to get rid of any possible fuel diluted oil? Or is that overkill? No black smoke or anything so it’s not THAT rich.

Let me know what you guys think.

-Paul
 
Has the PCV valve been replaced recently? If not I'd start there and see if that clears things up for you. I picked up an OEM valve, grommet and hose kit off eBay for $20.
 
Has the PCV valve been replaced recently? If not I'd start there and see if that clears things up for you. I picked up an OEM valve, grommet and hose kit off eBay for $20.

I’m sure she can use a new pcv valve, but I don’t think it would be causing the codes.
 

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