O2 sensor & Misfire codes

[JJT]

My mom's truck started running rough after she had her oil changed and her coolant flushed at Mr. Lube (they also scratched up the grille, free of charge).

Its an '09 V8 H3T with 88,000km on it. Its throwing 6 codes. P0030, P0135, P0300, P0030, P0053 and P0135.

I've also noticed that the transmission shifts a little higher when you punch it (5-6000RPM), and it is running a little warmer (closer to half vs half way between 1/4 and 1/2). The dome lights also dim a little when it misfires at idle. Could it have been that the idiots at Mr. Lube didn't get the air out of the radiator? a bad batch of gas?

I've got no idea guys, any help is appreciated.

Thanks,
Jeremy

 

[alrock]

I moved this to the H3 section as I think you'll get more and quicker responses here.

First, you've got three codes, not six. You listed each one twice.

I've also noticed that the transmission shifts a little higher when you punch it (5-6000RPM)

That sounds about normal for any vehicle. You're moving the transmission from the lazy fuel economy mode to a performance mode and the shift point moves up.

it is running a little warmer (closer to half vs half way between 1/4 and 1/2

Around 1/2 is normal. Below that is less common. It's also going to run hotter if you are driving it more aggressively

The dome lights also dim a little when it misfires at idle

Lights aren't your issue here, it's a normal byproduct of the engine not running properly.

Everything points to a bad O2 sensor here based on the codes you provided. P0300 is bank 1, sensor 1 so I'm guessing it's driver's side, before the cat. I would double check that it didn't get disconnected or broken, that the wiring isn't frayed, etc.

 

[JJT]

Thank you for the reply, I'll check it out in the morning,
I listed the 2 O2 sensor codes twice because thats how it showed on my scanner, I'm sorry if it caused any confusion.
If it is a bad O2 sensor do you think it would be a warrantied item?
Thanks,
Jeremy