2020 Editions Archives - UnderhoodService
Freeze Frame Diagnostics

Freeze frame data is a “snap shot” of when the code occurs of the specific sensor PIDs.

Chassis Control Modules After Reconnecting Battery

To resolve the issue, fully disconnect the negative lead from the battery terminal.

Caring For AGM And Flooded Car Batteries

Faulty battery cables, if loose, corroded, or damaged, can lead to power drainage.

Detecting Misfire And Knock Conditions

Knock sensors are mounted on the block near the base of the cylinder head.

Tech Tip: No Start in Cold Weather Due to No Weep Hole

This condition can be caused by condensation freezing in the muffler assembly.

Differentials And Diagnostics

A differential allows the two connected wheels to spin at different rates.

Domestic Gasoline Engine Oil Specifications

If it’s been more than a year since last oil change, the IOLM will display a reminder message, regardless of mileage.

Inspecting Oil Filters

Cartridge oil filters are easy to inspect, but canister oil filters only give you a limited view.

Do Oxygen Sensors Generate Electricity?

They are made of zirconium oxide, a chemical compound used to form the sensor’s thermal-driven electrochemical fuel cell.

EGR, Secondary Air Injection And Emissions Management

EGR systems put a small amount of inert gas into the combustion chamber to control the temperatures.

Mini Cooper Water Pump Service

The water pump is turned by a metal wheel driven by the crankshaft pulley.

How To Diagnose Slow or Sluggish Oxygen Sensors

When oxygen sensors are tested, manufacturers will introduce small amounts of oil to measure sensitivity.