P0042 — HO2S Heater Control Circuit Bank 1 Sensor 3

What Does P0042 Mean?

P0042 is a diagnostic trouble code indicating: HO2S Heater Control Circuit Bank 1 Sensor 3. This code relates to the fuel and air metering system. It has been reported in NHTSA complaints across 1 different vehicle models.

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"I purchased a 2011 Chevy Equinox LT from a used car dealer in April 2022 with 153,000 miles on it. The second day I had it the brake caliper completely fell off of my front passenger tire causing my wheels to lock. Couple days later I noticed that after an extended time of driving anything more than"
— Chevrolet Equinox owner, 04/17/2022

Source: NHTSA Complaints Database

Most Reported Vehicles for P0042

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	CHEVROLET EQUINOX

Frequently Asked Questions

Can I drive with this code?

You can usually drive short distances, but fuel economy will suffer and emissions will be higher. Get it diagnosed within a week.

Will this code cause my car to fail emissions?

Yes — any active check engine light will cause an automatic emissions test failure in most states.

How much does it typically cost to fix?

Depends on the root cause. Simple fixes like a gas cap ($5-15) to sensor replacement ($150-300) to more complex repairs ($500+).

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Clean or replace the mass air flow (MAF) sensor; check for vacuum leaks
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0042: HO2S Heater Control Circuit Bank 1 Sensor 3