AutoCodes – Cadillac – P1136 Cadillac

P1136 Cadillac Code - HO2S Rich Average Bank 1 Sensor 1

Quick Answer

P1136 Cadillac indicates HO2S Rich Average Bank 1 Sensor 1. Common causes for P1136 Cadillac include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1136 Cadillac indicates HO2S Rich Average Bank 1 Sensor 1.
Common causes: Common causes for P1136 Cadillac include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,627

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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Table of contents Created and updated by William Orellana on Apr 30, 2019

Description
How To Fix
Cost to Diagnose
FAQs
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Code P1136 Cadillac Description

OBDII Code P1136 Cadillac - HO2S Rich Average Bank 1 Sensor 1 - AutoCodes.com — P1136 Cadillac Code - HO2S Rich Average Bank 1 Sensor 1

How to Fix the DTC P1136 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1136 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1136 Cadillac Code

What does the OBDII code P1136 mean on a Cadillac?

P1136 indicates that the heated oxygen sensor (HO2S) for Bank 1 Sensor 1 is detecting a consistently rich air-fuel mixture that is outside the expected parameters.

What are the common symptoms of the P1136 code on a Cadillac?

Symptoms can include a check engine light, reduced fuel efficiency, rough idling, engine hesitation, or poor overall performance.

What causes the P1136 code to trigger?

Common causes include a faulty oxygen sensor, fuel system issues like a leaking fuel injector, a vacuum leak, a defective mass airflow (MAF) sensor, or an exhaust system problem.

How can I diagnose the P1136 code on my Cadillac?

Start by scanning the vehicle with an OBDII scanner, inspecting the oxygen sensor and related wiring, checking for vacuum or exhaust leaks, and verifying proper fuel pressure.

Can a dirty mass airflow (MAF) sensor cause the P1136 code?

Yes, a dirty or malfunctioning MAF sensor can cause incorrect air-fuel readings, potentially triggering the P1136 code.

Is it safe to drive my Cadillac with the P1136 code?

While the car may still be drivable, ignoring this code can lead to decreased fuel efficiency, poor performance, and potential long-term engine damage.

How do I fix the P1136 code on a Cadillac?

Possible fixes include replacing the faulty oxygen sensor, repairing vacuum or exhaust leaks, cleaning or replacing the MAF sensor, or addressing fuel system issues.

How much does it cost to repair the P1136 code?

Repairs can range from $100-$300 for a replacement oxygen sensor, while more extensive repairs like fixing vacuum leaks or replacing the MAF sensor may cost more.

Can a bad oxygen sensor cause the engine to run rich?

Yes, a faulty oxygen sensor can send incorrect signals to the engine control module (ECM), leading to an overly rich air-fuel mixture.

Will clearing the code fix the problem permanently?

No, clearing the code will only reset the check engine light temporarily. The underlying issue must be diagnosed and repaired to prevent the code from returning.