Lee3333

Thanks, now I can try switching the injectors. I checked again and only got P0131 again w times. Like i said before, the 171 only happened 2 times but I have had the TC problem since 2006 when I installed the cold air filter. But, since people with stock air filters also get the code, not sure why.

Would love it if the O2 sensor is all that is causing the code. How can I check? And what is the #2 sensor?

I am old school and know nothing about these electronics.

Thanks again for all the insight and help

donbrew

Here is a link I got from "p0131" in GoOgle.https://www.obd-codes.com/p0131

I was incorrect earlier it is O2 sensor #1. It could be the wires are compromised or the sensor is bad. It is possible that it is the cause of the P0171 in the past, before it gave up.

#1 sensor is the one closest to the engine.

Lee3333

Hi Don. In a different post, you told someone that unless his car was a 2006, you could see the sensor by looking down by the firewall. My car is an 06. What is the difference? Can I get at it from under the hood, or do I need to get under the car? I am assuming the flex pipe is not cracked or leaking because there does not seem to be any exhaust leak. I hope I am right. Again, thanks for all the help. Lord, this motor is so much more complicated (sophisticated) than the SBC in my race car.

donbrew

Some 2006 cars have the O2 sensor bung on the manifold other years have it on the pipe. You should be able to see it from the top either way. If it's on the pipe you may be able to replace it in situ, actually easier to take the pipe out. The locks on the electrical connections are challenging.

One member managed to detach his bicep trying to do it in the car.

The problem could be the wires are laying on the exhaust.

Neither of these look exactly like I remember, but close enough.

Lee3333

Thanks again. Checked this morning, and 3 codes-2 for the P0131 and once for P0171. The O2 sensor looks easy enough to change, as long as it is not locked in from the heat. One article said to use WD40 on the threads before installing the new one. I was thinking Antiseize compound. What do you recommend?

Also, wide range of prices. I assume the AC/Delco is the way to go....

What would I do without you?

donbrew

WD40 to get it out, New ones usually come with the right stuff, either in a tube or pre-applied.
My only brand advice is stay away from Bosch or any brand that is way too cheap. I think AC/Delco is actually made by NGK/NTK.

That boot is crumpled because your wheels are not pointed to the left. Rack & pinion. Normal. That is what tie rod ends are for.


The circled bit is supposed to be where the hose clamp is. The clamp is OK.
Attachment 21118

Lee3333

I changed the O2 sensor this afternoon. and for about 30 minutes drove code free, then the TC light popped up. A few minutes later, I got the check engine light came on. I checked the codes, and had 2 for T0131. I know it was long overdue to change that sensor, with 84K miles on it. But I think my injectors also need to be replaced. I could try switching them to see if the code changes to another cylinder.

Oldblue

I think that's a typo, if you meant P0131, then look at the wire harness for loose or damaged pins and wires.
As Don points out it might have melted if it touched the exhaust manifold or pipe!


https://www.obd-codes.com/p0131

Lee3333

Well, my wires all looked in good condition, and they were securely attached and not heat damaged.
I have been checking several times a day, and still keep getting the P0131 code. Worse, I just got that blasted P0171 code once the last time I checked.

Oldblue

P0131 isn't injectors, read this

https://www.obd-codes.com/p0131

Look at the wiring harness and connections to the first O2 sensor

For the P0171 you've addressed the fuel injectors, now check the other causes, like exhaust leak prior to the O2 sensor, like the flex pipe or the gasket from manifold to the down pipe

https://www.obd-codes.com/p0171