2015 1.8L LT Making Me Slam My Head Against the Wall

[Braf1895]

First post here and I'm in dire need of some input. My friend's Sonic has been having loads of problems.
Current Codes:
P0171, P0131, P015B, P0420

A couple of things worthy of note.

• He had it stall a couple of times when it was cold.
• There is a temp sensor PID that is stuck at 50F. Not sure which sensor, but the temp reading in the car is correct.
• We also have a code that mentioned 5V reference 1 being out, but this is intermittent
• There is an ABS code for the "Right Front Wheel Speed Sensor Circuit Low Voltage/Open"
• Radiator fan is stuck on high

We already replaced the downstream O2 sensor. This car has given us tons of problems before. I looked at the intake boot, but nothing looked damaged. I'm hoping that it's not a bad cat. I'd take any info I can get.

 

[SuperS13]

Hey there so the p0171, p0131, and p0420 are all related to each other and that's the bank 1 o2 sensor shot. First check voltage input should be .790-.900 at idle and as the rpms go up the voltage drops to .450-.500. If voltage is erratic and a mess just replace wiring or clean the connector and use di electric grease for better input signal. And obviously get a genuine gm bank 1 o2 sensor. Your problems should go away. And is this a 1.4L or a 1.8L? Also check the flex joint exhaust front pipe as that can cause a lean bank 1 code as well. It's a common issue.

 

[TinySonic10]

I had the P0420 and it was the flex pipe that had a hole. Replaced it and cleared the code.

 

[Jlsat3]

First post here and I'm in dire need of some input. My friend's Sonic has been having loads of problems.
Current Codes:
P0171, P0131, P015B, P0420

A couple of things worthy of note.

• He had it stall a couple of times when it was cold.
• There is a temp sensor PID that is stuck at 50F. Not sure which sensor, but the temp reading in the car is correct.
• We also have a code that mentioned 5V reference 1 being out, but this is intermittent
• There is an ABS code for the "Right Front Wheel Speed Sensor Circuit Low Voltage/Open"
• Radiator fan is stuck on high

We already replaced the downstream O2 sensor. This car has given us tons of problems before. I looked at the intake boot, but nothing looked damaged. I'm hoping that it's not a bad cat. I'd take any info I can get.

Figure it out. I just have the P0420. Already replaced the CAT and Both O2s.

 

[RFsonic]

My P0420 ended being a broken flex pipe! Where it flexing became detached I only found it because I was changing the rear cat out of frustration....walla the code is gone and never came back.

 

[RFsonic]

2017 Sonic 1.4 L turbo BTW... oh 2nd tiny sonic 10!