What causes P0172?

P0172 is triggered by the engine bank 1 “upstream” oxygen sensor and P0175 is triggered by the engine bank 2 “upstream” oxygen sensor. The oxygen sensor alerts your system when the condition is too rich meaning there’s too much fuel int the exhaust stream or too little oxygen in the exhaust stream.

Can O2 sensor Cause rich condition?

If an (O2) sensor gets “lazy” because of old age or contamination; the computer may not be able to adjust the fuel mixture quickly enough, as the engine’s operating conditions change. (O2) sensors that are failing tend to read lean; which causes the fuel system to run overly rich to compensate.

Will fuel injector cleaner help O2 sensor?

Fuel additives and injector cleaners that are labeled as “oxygen sensor safe” may be used in sensor-equipped vehicles. Use of additives not labeled as “oxygen sensor safe” can damage your oxygen sensor.

How do I fix code P0172 and P0175?

How to Fix P0172 and P0175. If the cooling temperature is good, the air filter is clean, the engine oil is not diluted and there are no other trouble codes, you may try cleaning the MAF sensor. Regardless if this is the issue, a good maintenance cleaning is always good, especially during air filter replacement.

What causes P0175?

A faulty fuel injector is the most common cause of a P0175 code. As it fails, the injector will leak and push too much fuel into the engine. A leak in the fuel lines can make it appear as if the injectors are not doing their jobs.

What are the p0172 and p0175 trouble codes?

A firing order and cylinder location diagram may be needed to see which side of the engine is Bank 1 or Bank 2. P0172 is triggered by the engine bank 1 “upstream” oxygen sensor and P0175 is triggered by the engine bank 2 “upstream” oxygen sensor.

What causes the O2 sensor to read p0172?

It is important to complete the entire diagnostic process when diagnosing P0172. Many people will replace the air-fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty Mass Air Flow (MAF) Sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate.

How much does it cost to repair a p0172 Chevy?

The cost to diagnose the P0172 CHEVROLET code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

How to troubleshoot p0172 system too rich, bank 1?

How do you troubleshoot code P0172 ? 1 MAF contamination could skew air intake measurements, therefore skewing fuel injection calculations. Cleaning may solve the problem. 2 Check fuel pressure, making sure that it is within the proper range. 3 Verify proper ECT and IAT (intake air temperature) readings.