Check Engine Light on and Error Codes: p0030 and p0135 | Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum
![P0171 Code — Causes, Symptoms, and Fixes – Genuine and OEM replacement car parts for European vehicles at the lowest price! P0171 Code — Causes, Symptoms, and Fixes – Genuine and OEM replacement car parts for European vehicles at the lowest price!](https://eeuroparts.com/wp-content/uploads/2022/09/p0171-code-explained-2-1024x634.webp)
P0171 Code — Causes, Symptoms, and Fixes – Genuine and OEM replacement car parts for European vehicles at the lowest price!
![I'm having only a p0030 code. Somewhere I read is that I may have a fault in the heated part of the downstream o2 sensor I'm having only a p0030 code. Somewhere I read is that I may have a fault in the heated part of the downstream o2 sensor](https://f01.justanswer.com/fEGLmFx6/image.jpg)
I'm having only a p0030 code. Somewhere I read is that I may have a fault in the heated part of the downstream o2 sensor
![S6 (C6 V10) P0030 ho2s heater control circuit bank 1 senso 1 - Page 1 - Audi, Seat, Skoda & VW - PistonHeads UK S6 (C6 V10) P0030 ho2s heater control circuit bank 1 senso 1 - Page 1 - Audi, Seat, Skoda & VW - PistonHeads UK](https://lh3.googleusercontent.com/image/jonhamilton/RnQe5joZwdI/AAAAAAAAAek/kcuilSUl79E/SensorsBanks.jpg)
S6 (C6 V10) P0030 ho2s heater control circuit bank 1 senso 1 - Page 1 - Audi, Seat, Skoda & VW - PistonHeads UK
![I'm having only a p0030 code. Somewhere I read is that I may have a fault in the heated part of the downstream o2 sensor I'm having only a p0030 code. Somewhere I read is that I may have a fault in the heated part of the downstream o2 sensor](https://f01.justanswer.com/hyxGSEyL/F06F9BA8-3FAC-40C0-9876-2DDCEFD82E91.jpeg)
I'm having only a p0030 code. Somewhere I read is that I may have a fault in the heated part of the downstream o2 sensor
![Smoke coming from left side under the engine, is it due to the leak? Check the PICS - AudiForums.com Smoke coming from left side under the engine, is it due to the leak? Check the PICS - AudiForums.com](https://www.audiforums.com/forum/attachments/b6-models-70/10596d1307394611-smoke-coming-left-side-under-engine-due-leak-check-pics-2011-06-06-16.20.52.jpg)