Is it safe to drive with this code?

In most cases, you can continue to drive in the short term, as the vehicle typically remains operational and driveable; however, climate control may behave unpredictably and fuel economy may be slightly reduced. Prompt diagnosis is recommended to prevent potential knock or lean-running issues. Refer to our site disclaimer for guidance on when to seek professional advice.

P0074 alone does not automatically result in MOT failure; what matters is whether the malfunction indicator lamp (check engine light) is illuminated at the time of the test. If the MIL is on, the vehicle may not pass. See our MOT and emissions disclaimer for full details.

Roughly how much does it cost to fix?

Costs vary depending on whether the issue is a simple connector clean (low two-figure), sensor replacement (low to mid three-figure including parts and labour at an independent garage), or wiring harness repair (mid three-figure). Dealer labour rates and more extensive electrical faults can push costs toward the high three-figure range. Always obtain quotes from multiple garages, as rates differ significantly across the UK.

Can I clean or reset the sensor instead of replacing it?

In some cases, cleaning corrosion from connectors or re-seating terminals can resolve intermittent faults, and clearing the code with a scanner may confirm the repair. However, if the sensor itself has failed internally or the wiring is chafed, replacement of the affected component will be necessary.

Professional mechanic working in workshop

← All fault codes | Electrical & Sensors

P0074

Powertrain

Ambient Air Temperature Sensor Circuit Intermittent

The ambient air temperature sensor circuit is sending an intermittent or erratic signal to the engine control module, which may affect climate control and engine management systems.

garage.co.uk

Need a garage?

Compare quotes from verified UK garages near you.

→

car.co.uk

Sell your car

We specialise in problem cars: warning lights, faults, high mileage. Fair instant offer.

→

trader.co.uk

List your car

Free private listing. Reach thousands of UK buyers, no fees.

→

ⓘ Information only. This page provides general educational information about fault code P0074. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.

Recommended next steps

Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.

What does P0074 mean?

P0074 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Ambient Air Temperature Sensor Circuit Intermittent.

This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

About Electrical & Sensors codes

Codes in the Electrical & Sensors category.

P0074 is one of 4,010 codes in this category. Browse all Electrical & Sensors codes →

What we know about P0074 specifically

We record the SAE J2012 standardised definition and the system this code belongs to, but we have not yet published detailed driver-reported symptoms, common causes, or step-by-step diagnostic guidance for P0074.

Rather than invent that information by generating generic content from a template, we leave it out. For specific guidance, the most reliable sources are:

•your vehicle's own service manual or manufacturer-specific technical bulletins
•a qualified mechanic with a manufacturer-level diagnostic tool
•a marque specialist familiar with your make and model

Codes nearby

Codes adjacent to P0074 in the P-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

P0071 Ambient Air Temperature Sensor Performance

P0072 Ambient Air Temperature Sensor Circuit Low

P0073 Ambient Air Temperature Sensor Circuit High

P0075 Intake Valve Control Solenoid Circuit (Bank 1)

P0076 Intake Valve Control Solenoid Circuit Low (Bank 1)

P0077 Intake Valve Control Solenoid Circuit High (Bank 1)

Other Electrical & Sensors codes

Other fault codes in the same system as P0074. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.

B1257

Air Temperature External Sensor Circuit Short To Ground Detailed guide

B1363

DBPT Circuit Short To Ground Detailed guide

B2100

Ignition Run/Start Input Circuit Performance Detailed guide

C2000

Steering Angle Sensor Not Calibrated Detailed guide

P0030

HO2S Heater Control Circuit (Bank 1 Sensor 1) Detailed guide

P0031

Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) Detailed guide

Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with P0074 can submit a correction or expansion. We review every submission before publishing, mechanic submissions are prioritised.

Information only, not professional advice

The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →

✎

Help us improve the P0074 page

Spotted an error, missing detail, or have first-hand experience to add? Tell us, we review every submission.