Guide To Engine Error Code P1520 For Geo Cars


If you’re a Geo Car owner, chances are you’ve encountered engine error code P1520. It’s not the most common of problems, but it can be intimidating when it crops up.

Don’t worry though – this guide has got your back! We’ll go over what that particular error code means and how to fix it quickly so you can get back on the road again in no time.

We’ll also cover warning signs that could point to other issues with your car before they require more serious attention from a professional mechanic.

So read on if you want to figure out why your car isn’t running smoothly and put an end to any further problems down the line.

What Is Error Code P1520?

Error code P1520 is a common diagnostic trouble code (DTC) that indicates an issue with the engine of your Geo car. This code often appears when one or more sensors in the vehicle’s powertrain system have failed, which can lead to several distinct symptoms for drivers to be aware of. To diagnose and troubleshoot this DTC, sensor testing must be conducted by a qualified mechanic.

When error code P1520 is triggered, it usually means that there’s a problem within the fuel delivery system. Depending on how severe the issue is, you may notice a decrease in power while accelerating, strange noises emanating from under the hood, increased emissions levels, rough idling behavior, and/or hesitation when shifting gears.

In some cases, the check engine light will appear as well. The best way to address any issues related to error code P1520 and ensure that your Geo car runs safely and efficiently is to take it into a certified auto shop. The technicians at these shops will connect their computer diagnostics systems directly to your car’s onboard computer so they can review all relevant data points and run tests on each of its various components – including its sensors – before providing you with detailed solutions for repairs or replacements.

Diagnosing The Problem

Once the engine error code P1520 is identified in a Geo car, it’s important to start diagnosing the problem.

There are several troubleshooting tips that can help you determine what may be causing this issue. Start by checking for any loose wiring and connections near the electric throttle control actuator, as well as any air leak around the intake manifold area or vacuum hoses.

Next, perform a thorough symptom analysis of all related components connected to the vehicle’s electronic throttle system. Listen closely for strange noises coming from the motor and consult your service manual if necessary.

Pay close attention to any changes in idle speed when the vehicle is running and monitor any differences between how quickly or slowly the engine responds when accelerating versus decelerating.

If none of these preliminary steps lead to an answer, consider replacing parts such as oxygen sensors, ignition coils, spark plugs, fuel injectors, mass airflow sensor and other similar components that could potentially be contributing to this problem. Doing so will not only save time but also money in comparison to trial-and-error replacements.

In some cases, updating software on certain types of vehicles can bring resolution without having to replace physical parts altogether.

Common Causes Of Error Code P1520

Driveability problems can cause P1520 error codes, so it’s important to inspect your car for any issues.

Damaged vacuum hoses and sensors can also trigger the code, so checking those components is essential.

If you have a Geo car, be sure to check the EGR system for any possible issues that might cause the code.

Finally, a faulty PCM could be the cause, so make sure to have it inspected if you’re having trouble with P1520.

Driveability Problems

Are you experiencing engine power issues or increased fuel consumption in your Geo car? Chances are, it’s related to a P1520 error code. This common OBD-II diagnostic trouble code indicates that the engine control module is having difficulty controlling the idle speed of your vehicle.

Let’s take a look at some of the main causes behind this issue.

One of the most frequent causes of P1520 is a faulty throttle body assembly. If the throttle body isn’t functioning correctly, it can cause an imbalance between air and fuel intake levels. This could lead to decreased engine power and higher than usual fuel consumption.

Sometimes, clogged air filters can also be responsible for an erroneous P1520 reading. Make sure to check if any debris has collected inside your filter before replacing other components as it may help solve your driveability problems without additional costs or labor involved.

Keeping up with regular maintenance will ensure that all parts are working properly and keep these types of errors from occurring again in the future.

Damaged Vacuum Hoses & Sensors

Another possible culprit for a P1520 error code is damaged vacuum hoses and sensors.

Over time, excessive wear can cause air leaks from the hoses that may lead to an imbalance in fuel-air mixture levels.

This could result in decreased engine power and increased fuel consumption.

Additionally, it’s possible for the oxygen sensors or other related components to become faulty due to prolonged use as well.

In any case, you should make sure all of your vehicle’s vacuum hoses are checked regularly and replaced if needed.

An experienced mechanic will be able to identify any worn out parts quickly and replace them with newer ones so you can get back on the road smoothly again.

Regular maintenance is key when ensuring proper function of your Geo car’s engine control module, so don’t forget to take good care of your ride!

Diy Fixes For Error Code P1520

Now that we’ve gone over the common causes of error code P1520, let’s take a look at some DIY fixes.

Faulty wiring is one of the most frequent problems with this engine issue, and can often be fixed by double-checking all connections or replacing any worn parts. It’s important to check for any loose connections as well so that you don’t have rewire anything after reinstalling it.

If there are no faults in the wiring, then another potential issue may be a worn part that needs to be replaced. This could include spark plugs, fuel injectors, sensors or even an alternator belt if need be. Replacing these parts should fix your problem but make sure to check compatibility before committing to purchase them.

To ensure your car runs smoothly, always use quality replacement parts and consult a professional mechanic when necessary. Doing regular maintenance on your vehicle will also help prevent possible issues from arising down the line and keep your car performing its best.

When To Seek Professional Help

You might be feeling overwhelmed trying to figure out the cause of engine error code p1520 on your Geo car. While troubleshooting this issue can feel daunting, it is important that you take the time and effort to diagnose the problem correctly.

Vehicle maintenance is key in ensuring your car runs smoothly, so don’t hesitate to seek professional advice if needed. When diagnosing a complex mechanical issue such as engine error code p1520, there are certain steps that must be taken for accurate resolution.

Starting with basic vehicle checks – including checking for any loose connections or hoses – then moving onto more complicated solutions such as replacing parts, may help resolve the issue faster. However, these repairs should only be attempted by an experienced mechanic who has extensive knowledge of vehicles like yours and understands the complexity of resolving engine issues safely and accurately.

It’s understandable if all of this seems overwhelming; after all, maintaining a vehicle takes both time and money. But having access to reliable transportation means investing in regular check-ups and services, which will ensure you get where you need to go safely every day.

So when dealing with engine error codes like P1520, make sure you consult a professional before attempting DIY repairs!

Frequently Asked Questions for P1520 Geo Errors

What Is The Estimated Cost To Repair Error Code P1520?

Troubleshooting and repairing engine error code P1520 can be costly.
Common causes include a damaged or faulty throttle body actuator, an issue with the vehicle’s wiring harness, or a problem with the ECU.
Depending on what is causing the error code to appear, repair costs can range from $500 – $2,000 for parts and labor.
It’s best to consult your local mechanic for a more accurate estimate of the cost.

Are There Any Other Error Codes Related To Error Code P1520?

Error code P1520 is a common engine error code in Geo cars. Diagnostic tools can help you identify the source of this problem, as well as any other related codes that could be causing it.
Symptoms commonly associated with this error code include stalling and slow acceleration.
It’s important to diagnose your vehicle thoroughly so all underlying issues are resolved and not just the symptom associated with the initial code.

Does Error Code P1520 Affect The Performance Of The Car?

Error code P1520 can have an effect on the performance of your car, depending on its severity.
Common causes for this error code include a faulty EGR valve or Throttle Position Sensor (TPS).
If you are experiencing poor engine performance due to P1520, it’s important to troubleshoot and identify the source of the issue in order to resolve any problems with your vehicle.

Are There Any Aftermarket Parts Available For Error Code P1520?

When it comes to error code P1520, there are some DIY repairs and troubleshooting tips available.
Fortunately, many aftermarket parts can be purchased for a relatively affordable price as an alternative for fixing the issue.
It is important to research which parts will work best with your car model before making any purchase decisions.

Is Error Code P1520 Covered By A Car Warranty?

Error code P1520 may be covered by a car warranty, depending on your coverage type.
Issues related to fuel efficiency and air quality are often included in comprehensive warranties, so there’s a good chance it will be included if these issues would arise from this specific error code.
However, it is best to check your car warranty for specifics about what types of repairs or services are covered.


The cost of repairing error code P1520 can vary depending on the make and model of your Geo car.

Other related codes may need to be addressed as well, so it’s important to have a professional inspect your vehicle if you experience this issue. Also, while error code P1520 does not usually affect performance directly, any underlying issues that caused the code could do so.

Thankfully, there are aftermarket parts available for those looking to save money on repairs.

Finally, some warranties may cover repair costs associated with error code P1520 – so be sure to check with your provider before paying out-of-pocket.

All in all, understanding engine errors is essential for keeping our vehicles running smoothly and safely over time!