OBD2 Info Guides

To fix P0128, check coolant level first, inspect for leaks, confirm the thermostat opens at the right temperature, test the…

P0128 causes usually start with a thermostat stuck open, low coolant, or a coolant temperature sensor reading wrong. The code…

P0128 symptoms usually include a check engine light, slow engine warmup, weak cabin heat, low temperature gauge readings, reduced fuel…

P0128 means your engine coolant temperature stayed below the thermostat’s expected regulating temperature. In plain English, your engine is running…

P0118 repair cost usually ranges from $150 to $550 when the problem is a bad engine coolant temperature sensor, connector,…

To fix P0118, scan the code, compare the coolant temperature reading with the cold engine temperature, inspect the coolant temperature…

P0118 causes usually come from a high-voltage signal in the engine coolant temperature sensor circuit. The most common causes are…

P0138 means the downstream oxygen sensor is reporting a high voltage signal, usually indicating a rich exhaust condition or a…

P0138 means the oxygen sensor on Bank 1 Sensor 2 is reporting a high voltage signal. This usually indicates a…

P0135 repair cost typically ranges from $120 to $450 depending on whether you replace just the oxygen sensor or fix…

To fix P0135, confirm the code, inspect the Bank 1 Sensor 1 oxygen sensor connector, test the heater fuse, check…

P0135 causes usually include a failed upstream oxygen sensor heater, damaged wiring, a blown fuse, corroded connector pins, poor ground,…

P0135 symptoms usually start with a check engine light, poor fuel economy, rough cold starts, and higher emissions. The code…

P0135 means the engine computer found a fault in the oxygen sensor heater circuit for Bank 1 Sensor 1. This…

P0133 repair cost usually ranges from $150 to $650 when the problem is an upstream oxygen sensor, wiring issue, or…