Let's break that down:
* P0160: This is the specific Diagnostic Trouble Code (DTC).
* Bank 2: Refers to the side of the engine that doesn't contain cylinder #1. (Bank 1 is the side with cylinder #1).
* Sensor 1: This is the upstream O2 sensor, located before the catalytic converter.
The "heater circuit" part means the electrical element within the O2 sensor that helps it heat up quickly to operate efficiently isn't working correctly. This can be due to a faulty O2 sensor itself, a blown fuse, a problem with the wiring to the sensor, or a problem with the PCM (Powertrain Control Module).
What this means for your Suburban: Your engine's computer (PCM) isn't receiving the correct information from the O2 sensor on Bank 2, leading to potential issues like:
* Reduced fuel efficiency: The engine's air/fuel mixture won't be optimized.
* Increased emissions: The catalytic converter won't be operating at peak efficiency.
* Rough idling or hesitation: The engine may run poorly.
* Failed emissions test: You might fail an emissions test.
To fix the issue, you'll likely need to:
1. Have the code verified: Use a code reader to confirm the P0160 code. A simple code reader from an auto parts store will suffice.
2. Inspect the wiring and connector: Check the wiring harness and connector for damage, corrosion, or loose connections to the O2 sensor.
3. Check the fuse: Ensure the relevant fuse for the O2 sensor heater circuit is not blown. Consult your owner's manual for fuse box locations and diagrams.
4. Replace the O2 sensor: If the wiring and fuse are okay, the O2 sensor itself may be faulty and needs replacement. This is the most common cause of this code. Be sure to get a replacement O2 sensor that's compatible with your 1999 Chevy Suburban.
5. Check the PCM: In rare cases, a problem with the PCM itself might be the culprit, but this is less likely than a faulty sensor or wiring.
It's always best to have a qualified mechanic diagnose and repair this issue. Ignoring the problem could lead to more serious engine problems down the road.
